XIX International Workshop on Neutrino Telescopes

Feb 18, 2021, 8:00 AM → Feb 26, 2021, 6:00 PM Europe/Rome

Online

Mauro Mezzetto

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The Neutrino Telescopes Workshop  dates back to 1988 when Prof. Milla Baldo Ceolin conceived it and launched the first edition.

The 2021 edition will focus to the original, at the time pioneering, topics of the workshop: Large Detectors for Neutrino Astrophysics, Neutrino Physics and Cosmology.

Due to Covid19 - Sars-Cov-2 circumstances, it will be held online. Registration is free but mandatory

Abstract submission for contributed talks and flash talks is now open. Conference proceedings will be published under the Zenodo platform.

The XIX International Workshop on Neutrino Telescopes is organized by  INFN Sezione di Padova and by the Physics and Astronomy Department of Padova University.

Under the patronage of
University of Padova celebrating in 2022 its 800 years of activity

                                               Sponsored by

                             

 

timetable.pdf

Thursday, February 18

2:00 PM → 2:40 PM Welcome

Convener: Giuseppina Salente (PD)

Welcome

2:00 PM Welcome to the Neutrino Telescopes Workshop

Speaker: Mauro Mezzetto (Chairperson) (INFN-PD)

Welcome

Welcome.pdf

2:10 PM Padova University

Speaker: Rosario Rizzuto (Padova University - Rettore)

Welcome

2:20 PM Istituto Nazionale Fisica Nucleare

Speaker: Antonio Zoccoli (BO)

Welcome

2:30 PM Physics and Astronomy Department, Padova

Speaker: Flavio Seno (dipartimento di fisica e astronomia "g. galilei" - Universitá di Padova)

Neutrino_2021.pdf

Welcome

2:35 PM INFN, Sezione di Padova

Speaker: Carlo Broggini (INFN-PD (director))

Welcome

2:40 PM → 4:00 PM Opening Plenary Session: (1)

Convener: Elisa Bernardini (Padova)

2:40 PM The past and the future of neutrino science

Speaker: Sheldon Glashow

DOI # 10.5281/zenodo.5785607

Opening Session-Nobel Prize

Sheldon Lee Glashow.pdf

3:00 PM Experimental searches of neutrino anomalies

Several anomalies had been collected for two decades in the neutrino sector beyond an ordinary 3-flavour mixing picture, suggesting the existence of some additional new related states.

Liquid argon TPC (LAr-TPC) is an ideal detection technology for neutrino physics, combining excellent 3D spatial reconstruction and calorimetry. The ICARUS-T600 detector has been he first large scale detector of this typology and its operation with the CNGS neutrino beam proven the maturity of the technique, while providing important results.

After a significant overhauling at CERN, the T600 detector has now been placed in its experimental hall at Fermilab where installation activities are in progress. It will be soon exposed to clarify in a definitive way the open questions of the presently observed neutrino anomalies. The contribution will address ICARUS achievements and plans for the sterile neutrino search at Fermilab. Data taking will begin during 2021.

Speaker: Carlo Rubbia (LNGS)

DOI # 10.5281/zenodo.5785597

NeuTel_Feb.18.final.pdf

NeuTel_Feb.18.final.pptx

Opening Session-Nobel Prize

3:30 PM Gravitational waves: where do we stand and future facilities

Speaker: Barry Barish

DOI # 10.5281/zenodo.5785523

Neutrino_Telescope f 02-21.pdf

Opening Session-Nobel Prize

4:00 PM → 4:15 PM Coffee Break

4:15 PM → 5:45 PM Opening Plenary Session: (2)

Convener: Luca Stanco (PD)

4:15 PM High Energy Neutrino Astronomy

Speaker: Francis Halzen (University of Wisconsin Madison)

DOI # 10.5281/zenodo.5785569

Keynote Speaker

Padova_Telescopes_Halzen.pdf

4:45 PM Cosmology, the present landscape

Speaker: Marc Kamionkowski

DOI # 10.5281/zenodo.5785584

EDEnu_Kamion.pptx

Keynote Speaker

5:15 PM 10^27, 10^28, 10^29 ? The future of double beta decays

Speaker: Fernando Ferroni (ROMA1)

DOI # 10.5281/zenodo.5785542

Keynote Speaker

VeniceDBD.pdf

6:15 PM → 6:30 PM Coffee Break

Friday, February 19

10:00 AM → 11:20 AM Cross Sections: (Room 1)

Conveners: Fabio Pupilli (PD), Filippo Varanini (PD)

10:00 AM Measuring cross-sections of high-energy neutrinos with FASERnu at the LHC

FASERnu is a new experiment to measure interaction cross-sections of neutrinos that are produced in proton-proton collisions at the LHC. The detector will be installed 480 m downstream from the interaction point of the ATLAS experiment during 2021, aiming to collect physics data during Run 3 of the LHC. About 10,000 charged-current neutrino interactions with mean energies of ~1 TeV are expected in FASERnu. There are no existing neutrino cross-section measurements in this energy range. In addition, the measurement will reduce systematic errors on the forward charm production rate and constrain the prompt atmospheric neutrino background for the extragalactic neutrino searches at IceCube. FASERnu can detect interactions of all three neutrino flavors with the excellent track reconstruction capability, utilizing the emulsion detector in cooperation with the silicon tracking in FASER behind it. In this talk, the physics prospects for FASERnu as well as status of the detector construction and installation will be presented.

Speaker: Yosuke Takubo (KEK)

DOI # 10.5281/zenodo.4668559

fasernu210219.pdf

Measuring cross-sections of high-energy neutrinos with FASERνat the LHC

10:20 AM Probing nuclear effects in neutrino CC\1pi^+ interactions with transverse kinematic imbalance measurement in T2K

Neutrino interactions with nuclei are the main experimental tool used to study neutrinos in many different contexts, and systematic uncertainties arising from neutrino-nucleus interactions, especially those related to nuclear effects, can be a limiting factor in their energy reconstruction. For the CC1pi interaction, which is dominated by resonant production, physics of the initial state nucleon correlations, self-energy corrections of the force mediator, and the Delta resonance propagation inside the nucleus are not well-modelled. We present the first experimental study of nuclear medium effects in CC1pi+ interaction by measuring the kinematic imbalance between the muon, pion and proton in the plane transverse to the incoming neutrino. The extracted cross-section as a function of the imbalance is sensitive to the nuclear physics model and final state interactions. This new measurement provides unique constraints to characterize the nuclear effects in neutrino interaction modelling.

Speaker: Ka Ming Tsui (University of Liverpool)

2_t2k_cc1pi_tki_final.pdf

DOI # 10.5281/zenodo.4668421

Probing nuclear effects in neutrino CC\1pi^+ interactions with transverse kinematic imbalance measurement in T2K

10:40 AM First constraints on coherent elastic neutrino-nucleus scattering at reactor site with the CONUS experiment

The detection of neutrinos through Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) process opens a new window to study the fundamental properties of this elusive particle and to probe physics beyond the Standard Model. The CONUS experiment – operational since April 2018 – is located at 17$\,$m from the 3.9$\,$GW$_{\text{th}}$ core of the nuclear power plant Brokdorf (Germany) and aims to detect CE$\nu$NS in the fully coherent regime with four 1 kg-sized HPGe point-contact detectors with a ~$\,$300$\,$eV$_{\text{ee}}$ energy threshold. The full spectral analysis of the first CONUS dataset including 248.7$\,$kg.d reactor-on and 58.8$\,$kg.d reactor-off allowed to set the current best limit on the coherent elastic scattering of reactor antineutrinos. This result will be presented, along with the details of the systematic uncertainties and the full Monte-Carlo description of the background. A special emphasis will be put on the strategy followed by the collaboration to further reduce the uncertainties, in particular via a dedicated measurement of the ionization quenching factor of nuclear recoils in germanium.

Speaker: Aurélie Bonhomme (MPIK Heidelberg)

20210219_NuTel_CONUS_bonhomme.pdf

DOI # 10.5281/zenodo.4670231

First constraints on coherent elastic neutrino-nucleus scattering at reactor site with the CONUS experiment

11:00 AM Recent results: Hadron production measurements for neutrino oscillation experiments at NA61/SHINE

Hadron production measurements are crucial for helping long-baseline
neutrino oscillation experiments constrain their beam flux
uncertainties. These uncertainties represent a leading systematic
uncertainty on measured neutrino oscillation parameters. At the
NA61/SHINE experiment, interactions of charged hadrons with various
materials relevant to neutrino production are recorded and analyzed.
NA61/SHINE data has been used to significantly improve the
(anti)neutrino flux prediction at the T2K experiment. This talk will
present recent analysis results of 60 GeV/c and 120 GeV/c protons on a
carbon target, interactions relevant to neutrino production at DUNE.
More thin and replica target measurements are forseen at NA61/SHINE
after CERN's Long Shutdown 2.

Speaker: Brant Rumberger (University of Colorado Boulder)

DOI # 10.5281/zenodo.4670163

NA61- XIX Workshop On Neutrino Telescopes 2021 - 2-19-21.pdf

Recent results: Hadron production measurements for neutrino oscillation experiments at NA61/SHINE

10:00 AM → 11:20 AM Low Energy Neutrinos: (Room 2)

Conveners: Chiara Sirignano (PD), Luca Stanco (PD)

10:00 AM Constraining sterile neutrinos by core-collapse supernovae with multiple detectors

The eV-scale sterile neutrino has been proposed to explain some anomalous results in experiments,such as the deficit of reactor neutrino fluxes and the excess of $\bar{\nu}_\mu\to\bar{\nu}_e$ in LSND. This hypothesis can be tested by future core-collapse supernova neutrino detection independently since the active-sterile mixing scheme affects the flavor conversion of neutrinos inside the supernova.
In this work, we compute the predicted supernova neutrino events in future detectors -- DUNE, Hyper-K, and JUNO -- for neutrinos emitted during the neutronization burst phase when the luminosity of $\nu_e$ dominates the other flavors.
We find that for a supernova occurring within 10 kpc, the difference in the event numbers with and without sterile neutrinos allows to exclude the sterile neutrino hypothesis at more than $99\%$ confidence level robustly.
The derived constraints on sterile neutrinos mixing parameters are comparably better than the results from cosmology and on-going or proposed reactor experiments by more than two orders of magnitude in the $\sin^22\theta_{14}$-$\Delta m_{41}^2$ plane.

Speaker: Jian Tang (Sun Yat-Sen University)

20210219_Constraining_sterile_neutrinos_at_core-collapse_supernova_by_JianTang_SYSU.pdf

Constraining sterile neutrinos by core-collapse supernovae with multiple detectors

DOI # 10.5281/zenodo.4704567

10:20 AM Supernova Model Discrimination with Hyper-Kamiokande

Core-collapse supernovae are among the most magnificent events in the observable universe. They produce many of the chemical elements necessary for life to exist and their remnants—neutron stars and black holes—are interesting astrophysical objects in their own right. However, despite millennia of observations and almost a century of astrophysical study, the explosion mechanism of core-collapse supernovae is not yet well understood.

Hyper-Kamiokande is a next-generation neutrino detector that will be able to observe the neutrino flux from the next galactic core-collapse supernova in unprecedented detail.
We focus on the first 500 ms of the neutrino burst, corresponding to the accretion phase, and use a newly-developed, high-precision supernova event generator to simulate Hyper-Kamiokande’s response to five different supernova models. We show that Hyper-Kamiokande will be able to distinguish between these models with high accuracy for a supernova at a distance of up to 100 kpc.

Once the next galactic supernova happens, this ability will be a powerful tool for guiding simulations towards a precise reproduction of the explosion mechanism observed in nature.

Speaker: Jost Migenda (King’s College London)

20210219_SN_Model_Discrimination.pdf

DOI # 10.5281/zenodo.4704581

Supernova Model Discrimination with Hyper-Kamiokande

10:40 AM Recent results from XENON1T and multi-messenger future of XENONnT

The XENONnT detector recently started its commissioning phase at Laboratori Nazionali del Gran Sasso. Utilizing 5.9 tonnes of liquid xenon (LXe) as active target and designed for a high level of background reduction, it will greatly improve the results of its predecessor, XENON1T. Although primarily a dark matter (DM) detector whose main channel is the direct detection of Weakly Interacting Massive Particles (WIMPs), other channels such as the neutrinoless double beta decay of $^{136}$Xe, the two-neutrino double electron capture process in $^{124}$Xe, the standing excess of electronic recoil events observed in XENON1T data or the observation of coherent elastic scattering of $^8$B neutrinos in LXe will play a important role in XENONnT future analysis. Furthermore, XENONnT will also focus on multi-messenger astrophysics, acting as an active observatory of supernova neutrinos and contributing to the Supernova Early Warning System (SNEWS).

We report on the latest results of XENON1T and look into the planned future of XENONnT, highlighting its plans to look for supernovae events up to the Large Magellanic Cloud in real-time and connect with SNEWS, its inter-experiment coincidence trigger and triangulation mechanisms.

Speaker: Ricardo Peres (University of Zürich)

DOI # 10.5281/zenodo.4705048

Recent results from XENON1T and multi-messenger future of XENONnT

talk_IWNT2021_RP_full.pdf

11:00 AM How the CNO neutrinos detection can unravel the solar metallicity problem?

The “solar metallicity problem” is one of the most long-standing puzzles in solar physics. It consists in the discrepancy between several Sun physical properties predicted by solar models using updated metal abundances from spectroscopy (low-metallicity scenario, LZ-SSM), and those inferred from helioseismology, which favours a higher metal content (high-metallicity scenario, HZ-SSM). The solar neutrino fluxes depend on the chemical composition of the Sun: their precise measurements can be used to test the solar models, and to discriminate the between the two scenarios. A considerable progress in solar neutrino physics comes by the Borexino experiment, which recently claimed the first detection of neutrinos emitted from the CNO cycle. In this sequence, the hydrogen fusion is catalysed by carbon, nitrogen and oxygen, and so the flux of CNO neutrinos depends directly on the abundance of these elements in the solar core. For this reason, the CNO neutrinos flux strongly depend on the metallicity scenario, leading to a ~30% difference between the HZ-SSM and LZ-SSM predictions. In this talk, the implications of the CNO detection by Borexino for solar physics are discussed, combining this latest result with the previous measurement of 7Be and 8B neutrino fluxes. In this way, a mild preference for HZ scenario is found, disfavouring LZ hypothesis at a level of 2.1σ significance. Moreover, the impact of future experimental improvements for the CNO neutrino flux determination will be addressed. This work is presented on behalf of the Borexino Collaboration.

Speaker: Mr Davide Basilico (University of Milan / INFN Milano)

DOI # 10.5281/zenodo.4704695

How the CNO neutrinos detection can unravel the solar metallicity problem?

Neutel2021_CNO-SolarPhysics_Basilico.pdf

10:00 AM → 11:20 AM Non Standard Interactions: (Room 3)

Conveners: Francesco D'Eramo (PD), Giuseppina Salente (PD)

10:00 AM Possible indication of non-standard neutrino interactions from NOvA and T2K

The latest data of the two long-baseline accelerator experiments NO$\nu$A and T2K, interpreted in the standard 3-flavor scenario, display a tension. A mismatch in the determination of the standard CP-phase $\delta_{\mathrm {CP}}$ extracted by the two experiments is evident in the normal neutrino mass ordering. While NO$\nu$A prefers values close to $\delta_{\mathrm {CP}} \sim 0.8 \pi$, T2K identifies values of $\delta_{\mathrm {CP}} \sim 1.4 \pi$. Such two estimates are in disagreement at more than 90$\%$ C.L. for 2 degrees of freedom. In this talk, we show that such a discrepancy can be resolved if one hypothesizes the existence of complex neutral-current non-standard interactions (NSI) of the flavor changing type involving the $e-\mu$ or the $e-\tau$ sectors with couplings $|\varepsilon_{e\mu}| \sim |\varepsilon_{e\tau}|\sim 0.2$. Remarkably, in the presence of such NSI, both experiments point towards the same common value of the standard CP-phase $\delta_{\mathrm {CP}} \sim 3\pi/2$. Our analysis also highlights an intriguing preference for maximal CP-violation in the non-standard sector with the NSI CP-phases having best fit close to $\phi_{e\mu} \sim \phi_{e\tau}\sim 3\pi/2$, hence pointing towards imaginary NSI couplings.

Speaker: Prof. Antonio Palazzo (University of Bari and INFN)

DOI # 10.5281/zenodo.4671850

NeuTel_2021_talk_palazzo_proceedings.pdf

video

10:20 AM Sterile neutrinos properties in the inverse seesaw with Abelian flavour symmetries

We study the phenomenology of the minimal (2,2) inverse-seesaw model supplemented with Abelian flavour symmetries. To ensure maximal predictability, we establish the most restrictive flavour patterns which can be realised by those symmetries. This setup requires adding an extra scalar doublet and two complex scalar singlets to the Standard Model, paving the way to implement spontaneous CP violation. It is shown that such CP-violating effects can be successfully communicated to the lepton sector through couplings of the scalar singlets to the new sterile fermions. The Majorana and Dirac CP phases turn out to be related, and the active-sterile neutrino mixing is determined by the active neutrino masses, mixing angles and CP phases. We investigate the constraints imposed on the model by the current experimental limits on lepton flavour-violating decays, especially those on the branching ratio BR(μ→eγ) and the capture rate CR(μ−e,Au). The prospects to further test the framework put forward in this work are also discussed in view of the projected sensitivities of future experimental searches sensitive to the presence of heavy sterile neutrinos. Namely, we investigate at which extent upcoming searches for μ→eγ, μ→3e and μ−e conversion in nuclei will be able to test our model, and how complementary will future high-energy collider and beam-dump experiments be in that task.

Speaker: Filipe Joaquim

DOI # 10.5281/zenodo.4672477

Proceedings Joaquim.pdf

video

10:40 AM New Physics in the Lepton sector from future Neutrino experiments

The phenomenon of Neutrino Oscillation has been very well confirmed by a plethora of data; we are now entering a precision era in which the mixing angles and mass differences are going to be measured with unprecedented precision by ongoing and planned experiments. However, the new measurements could reveal that the standard three flavor scenario is not enough for a complete description of oscillations and a new paradigm beyond the standard physics in the lepton sector must be invoked. In this talk I will review the current experimental situation on neutrino masses and mixing and discuss some example of physics beyond the Standard Model that could show up in the next years.

Speaker: Prof. Davide Meloni (ROMA3)

DOI # 10.5281/zenodo.4671796

meloni_fin.pdf

video

11:00 AM "HENeutrinos beyond Standard Model: steriles and secret interactions

Ultra High Energy neutrinos may represent a unique opportunity
to unveil possible new physics interactions in the neutrino sector. At
this regard, we have investigated the effects on high and ultrahigh energy
active neutrino fluxes due to active-sterile secret interactions mediated
by a new pseudoscalar particle. These interactions become relevant at
very different energy scales depending on the masses of the scalar
mediator and of sterile neutrino. As a consequence, we have found
interesting phenomenological implications on two benchmark fluxes we
consider, namely an astrophysical power law flux, in the range below 100
PeV, and a cosmogenic flux, in the Ultrahigh energy range. These features could be measurable in present and future neutrino experiments.

Speaker: Ninetta Saviano (Istituto Nazionale di Fisica Nucleare)

20210219_Saviano.pdf

DOI # 10.5281/zenodo.4671424

video

11:20 AM → 11:35 AM Coffee Break

11:35 AM → 12:05 PM Cross Sections: (Room 1)

Conveners: Andrea Longhin (PD), Christian Farnese (PD)

11:35 AM Towards the cross-section measurement of the charged current muon antineutrino single pion production in the T2K near detector

The goal of the presented analysis is the measurement of the muon antineutrino single $\pi^{-}$ production interactions on CH ($\bar\nu_{\mu} + N \rightarrow \mu^{+} + \pi^{-} + X$) in the T2K off-axis near detector. This interaction mode is the second largest at T2K energies and studies are ongoing to include such events in T2K oscillation analysis which for $\bar\nu_{\mu}$ beam mode is currently limited to Charged Current (CC) quasi-elastic events. For this reason, a more detailed understanding of this interaction channel using near detector data is becoming increasingly vital. The measurement will be a double differential cross-section in muon kinematics and will be extracted using a binned likelihood fit. The event selection strategy developed for this analysis along with the validation studies performed to check the analysis robustness are discussed in this presentation.

Speaker: Mr Grzegorz Zarnecki (National Centre for Nuclear Research, Poland)

DOI # 10.5281/zenodo.4668646

Flash_talk_gzarnecki.pdf

Towards the cross-section measurement of the charged current muon antineutrino single pion production in the T2K near detector

11:40 AM Measurement of the Electron-Neutrino Charged-Current Inclusive Cross-Section on Argon in MicroBooNE

Electron-neutrino appearance is a crucial channel for searches of sterile neutrinos in short-baseline experiments and measurements of Charge-Parity (CP) violation in long-baseline oscillation experiments. The precise knowledge of the electron neutrino cross section will, therefore, play a key role in reducing the uncertainties of these future experiments. There are only a handful of electron neutrino cross section measurements in the hundred MeV to GeV range and only one on argon. Therefore, there is a need for new, high statistics measurements of this quantity. MicroBooNE is a Liquid Argon Time Projection Chamber (LArTPC) located at Fermilab which simultaneously receives a flux of neutrinos from the on-axis Booster Neutrino Beam (BNB) beam and off-axis Neutrinos at the Main Injector (NuMI) beam. While MicroBooNE uses BNB data for short baseline sterile oscillation searches, data from the NuMI beam provide an excellent opportunity to simultaneously measure the electron-neutrino cross section, thanks to its higher electron-neutrino flux component. This talk will cover the current status of inclusive charged-current electron neutrino cross-section measurement on argon in MicroBooNE using the NuMI beam.

Speaker: Marina Reggiani Guzzo (University of Manchester)

DOI # 10.5281/zenodo.4670217

Measurement of the Electron-Neutrino Charged-Current Inclusive Cross- Section on Argon in MicroBooNE

NeuTel2021_MarinaReggianiGuzzo.pdf

11:45 AM Characterising 2p2h interactions using low momentum protons

Neutrino interactions off correlated nucleon pairs (2p2h interactions) are thought to contribute significantly to events detected by long baseline neutrino oscillation experiments. These 2p2h processes are challenging to model and the corresponding uncertainties can be responsible for some of the leading systematic uncertainties in measurements of neutrino oscillation parameters. To help alleviate these uncertainties in future measurements, T2K aims to precisely characterise 2p2h interactions at it's near detector facility (ND280). A key signature for 2p2h interactions is the production of final states with multiple nucleons. However, ND280 is only able to reconstruct protons and only those above 450 MeV/c momenta. The consequence of this high momentum threshold is that the majority of 2p2h interactions are thought to leave at least one proton below detection threshold. To circumvent this issue, recent analysis efforts have tried to tag low momentum protons via calorimetric measurements of energy deposited near the neutrino interaction vertex, so called "vertex activity". This talk presents such an analysis considering events with one reconstructed muon track, one reconstructed proton track and a search for a 2nd proton in the vertex activity.

Speaker: Dr Joanna Zalipska (National Centre of Nuclear Research)

Characterising 2p2h interactions using low momentum protons

DOI # 10.5281/zenodo.4668679

jzalipska_charakterize2p2h.pdf

11:50 AM Extraction of the Inclusive Muon Neutrino Charged Current Cross Section at MicroBooNE

The MicroBooNE detector has an active mass of 85 tons of liquid argon and is located along the Booster Neutrino Beam (BNB) at Fermilab. It has a rich physics program including the search for a low-energy excess observed at MiniBooNE and measurements of neutrino-Argon interaction cross sections. In this talk, we present a procedure, based on the Wiener-SVD unfolding method, to extract the nominal neutrino flux-averaged total and differential cross sections of the inclusive muon neutrino charged-current interaction on argon. This procedure relies on a minimal set of assumptions while maximizing the power in comparing data results with predictions from theory and event generators. Taking advantage of the power of a Liquid Argon Time Projection Chamber (LArTPC) and the Wire-Cell tomographic event reconstruction paradigm, this procedure enables a new round of cross section measurements at MicroBooNE.

Speaker: Wenqiang Gu (Brookhaven National Laboratory)

DOI # 10.5281/zenodo.4670252

Extraction of the Inclusive Muon Neutrino Charged Current Cross Section at MicroBooNE

WireCell_Inclusive_numuCC_NueTel2021_WGu.pdf

11:55 AM Discussion Time

11:35 AM → 12:35 PM Low Energy Neutrinos: (Room 2)

Conveners: Chiara Sirignano (PD), Marco Grassi (University of Padova - INFN)

11:35 AM Data analysis of a low-polonium-field for the discovery of CNO neutrinos

Recently the first direct observation of CNO neutrinos was achieved with a high statistical significance. This challending observation was made using the highly radiopure liquid-scintillator detector Borexino located in the Laboratori Nazionali del Gran Sasso in Italy. The spectral shape of CNO neutrino interactions in the liquid scintillator of the Borexino detector is very similar to that of the main background: intrinsic 210Bi decays. The ensuing high correlations in Borexino's spectral fits make an independent determination of a 210Bi constraint necessary in order to claim a measurement or discovery of CNO neutrinos. In this talk the methods used to extract the 210Bi rate from 210Po data, selected with pulse shape discrimination methods, are discussed, as well as how systematic uncertainties were treated.

Speaker: Mr Alexandre Göttel (FzJ IKP-2, Physikalisches Institut 3B RWTH Aachen)

Data analysis of a low-polonium-field for the discovery of CNO neutrinos

DOI # 10.5281/zenodo.4705009

SplinesNeutel (1).pdf

11:40 AM A successful strategy for the CNO measurement with Borexino: the MultiVariate Fit

Borexino is an experiment designed and constructed for real-time detection of low energy solar neutrinos. It is installed at the underground Laboratori Nazionali del Gran Sasso (L’Aquila, Italy) and started taking data in May 2007. Today, the detector is characterized by an extreme and unique radiopurity. The Borexino collaboration has recently published the first direct measurement of the CNO (Carbon-Nitrogen-Oxygen) solar neutrinos rate: this measurement is crucial for the precision modeling of solar physics and for astrophysics in general.
In this contribution, I present the event selection criteria and the strategy adopted by the Borexino collaboration for successfully isolating the spectral component of the CNO signal from the residual backgrounds: a multivariate analysis performed by simultaneously fitting the energy and radial distributions of selected events.

Speaker: Alessandra Carlotta Re (MI)

A successful strategy for the CNO measurement with Borexino: the MultiVariate Fit

DOI # 10.5281/zenodo.4704708

Neutel2021_RE.pdf

11:45 AM Solar Antineutrinos Searches and Decaying Sterile Neutrinos

Solar neutrino experiments have had great success in furthering our understanding of the neutrino sector and the Sun. Experiments like BOREXINO, KamLAND, and SuperKamiokande are also sensitive to antineutrino fluxes at the level of sub per-mille of the B8 neutrino flux. We explore this in our work to derive constraints on a model of decaying sterile neutrinos, recently proposed as a solution to the LSND, MiniBooNE anomalies.

Speaker: Matheus Hostert (University of Minnesota & Perimeter Institute)

DOI # 10.5281/zenodo.4705100

mhostert_talk.mp4

Solar Antineutrinos Searches and Decaying Sterile Neutrinos

Talk_slides_mhostert.pdf

11:50 AM Supernova Neutrino Energy Spectrum Reconstruction in JUNO with a probabilistic unfolding method

Observation of Supernovae through their neutrino emission is a major fundamental point to understand both supernovae dynamics and neutrino physical properties. JUNO is a multi- purpose neutrino experiment with a 20 kton liquid scintillator detector under construction in Jiangmen, China. The main aim of the experiment is to determine neutrino mass hierarchy by precisely measuring the energy spectrum of reactor electron antineutrinos at a distance of ∼ 53 km from the reactors. For the next galactic core-collapse supernova (SN),JUNO has the capability of detecting a high statistics of SN events. While existing data from SN neutrino consist only of a few events coming from the SN1987A, the detection of a SN burst in JUNO from a progenitor star at 10 kpc will yield ∼ 5 × 103 IBD events from electron antineutrinos, around 2000 events from all flavor elastic neutrino-proton scattering, as well as more than 300 events from neutrino-electron scattering, and the charge current and neutral current interaction of neutrinos on the 12C nuclei. In this work an study of SN neutrino events with the JUNO detector through their main three channels is presented with the aim of reconstructing the neutrino energy spectrum separately and all together. The reconstruction of the supernova neutrino energy spectra is based on a probabilistic unfolding method.

Speaker: Cristina Martellini (Roma Tre Univ)

DOI # 10.5281/zenodo.4704772

NuTel_Martellini.pdf

Supernova Neutrino Energy Spectrum Reconstruction in JUNO with a probabilistic unfolding method

11:55 AM Discussion Time

12:05 PM Core-Collapse Supernova Neutrinos in JUNO

The Jiangmen Underground Neutrino Observatory (JUNO) will play an essential role in detecting neutrinos from core-collapse supernova (CCSN). Designed with a 20 kt liquid scintillator detector, JUNO has capability to register all flavors of O(10MeV) supernova burst neutrinos with several channels. Even the O(1 MeV) pre-supernova neutrinos from the advanced stages of stellar evolution are detectable for the nearby progenitors, thanks to the low energy threshold of the liquid scintillator detector. For the next CCSN in the Galaxy and its vicinity, a real-time monitor system with supernova burst neutrinos and pre-supernova neutrinos as diagnostics is currently under development in JUNO, to provide early alerts for its multi-messenger follow-up observations. Besides, JUNO's sensitivity to the neutrino flux from all the supernovae occurred in the Universe in aggregate (Diffuse Supernova Neutrino Background, DSNB) is competitive to that of the Super-K with gadolinium phase, and will be discussed as well.

Speaker: Huiling Li

20210219_ccsnJUNO_LHL.pdf

Core-Collapse Supernova Neutrinos in JUNO

DOI # 10.5281/zenodo.4704533

12:10 PM On Stellar Evolution in a Neutrino Hertzsprung–Russell Diagram

We explore the evolution of a select grid of solar metallicity stellar models from their pre-main sequence phase to near their final fates in a neutrino Hertzsprung-Russell diagram, where the neutrino luminosity replaces the traditional photon luminosity. Using a calibrated MESA solar model for the solar neutrino luminosity ($L_{\nu,\odot}$ = 0.02398 $\cdot$ $L_{\gamma,\odot}$ = 9.1795 $\times$ 10$^{31}$ erg s$^{-1}$) as a normalization, we identify $\simeq$0.3 MeV electron neutrino emission from helium burning during the helium flash (peak $L_{\nu} / L_{\nu,\odot} \simeq$ 10$^4$, flux $\Phi_{\nu, {\rm He \ flash}} \simeq$ 170 (10 pc/$d$)$^{2}$ cm$^{-2}$ s$^{-1}$ for a star located at a distance of $d$ parsec, timescale $\simeq$ 3 days) and the thermal pulse (peak $L_{\nu} / L_{\nu,\odot} \simeq$ 10$^9$, flux $\Phi_{\nu, {\rm TP}} \simeq$ 1.7$\times$10$^7$ (10 pc/$d$)$^{2}$ cm$^{-2}$ s$^{-1}$, timescale $\simeq$ {0.1 yr) phases of evolution in low mass stars as potential probes for stellar neutrino astronomy. We also delineate the contribution of neutrinos from nuclear reactions and thermal processes to the total neutrino loss along the stellar tracks in a neutrino Hertzsprung-Russell diagram.
We find, broadly but with exceptions, that neutrinos from nuclear reactions dominate whenever hydrogen and helium burn, and that neutrinos from thermal processes dominate otherwise.

Speaker: Ebraheem Farag (Arizona State University)

DOI # 10.5281/zenodo.4704723

Neutrino_telescopes_farag.pdf

On Stellar Evolution in a Neutrino Hertzsprung–Russell Diagram

12:15 PM The Diffuse Supernova Neutrino Background in Super-Kamiokande

Neutrinos have played a key role in astrophysics, from the characterization of nuclear fusion processes in the Sun to the observation of supernova SN1987A and multiple extragalactic events. The Super-Kamiokande experiment has played a major part in past in these astrophysical studies by investigating low energy O(10)MeV neutrinos and currently exhibits the best sensitivity to the diffuse neutrino background from distant supernovae. Discovering and characterizing this signal however presents significant challenges due to important backgrounds from cosmic muon spallation and atmospheric neutrinos. Reducing these backgrounds will require implementing state-of-the-art neutron tagging algorithms to discriminate between different types of interactions, as well as a thorough characterization of spallation-inducing mechanisms. Here, I present an overview of the search for the DSNB in Super-Kamiokande, and discuss how the current strategies will evolve after the SuperK-Gd upgrade.

Speaker: Alberto Giampaolo (LLR - Ecole Polytechnique)

DOI # 10.5281/zenodo.4704606

neutel21.pdf

The Diffuse Supernova Neutrino Background in Super-Kamiokande

12:20 PM Theory of Fast Flavor Conversion for Supernova neutrinos

We all know that in the dense anisotropic interior of the star, neutrino- neutrino forward-scattering can lead to fast collective neutrino oscillations, which has striking consequences on flavor dependent neutrino emission and can be crucial for the evolution of a supernova and its neutrino signal. Although the triggering and initial growth of fast oscillations are understood, owing to its complicated nonlinear evolution, the final impact is not yet known. Interestingly, stellar explosion and the neutrino signal are sensitive to the processed flavor-dependent fluxes, but the required neutrino theory prediction is still lacking. In my talk I will address this crucial theoretical and phenomenological obstacle and present a theory of fast flavor conversions that will explain how, when and to what extent do the flavor differences change. Finally, I will give a method and a simple formula for computing the final fluxes that can be a crucial input for supernova theory and neutrino phenomenology. This work solves a critical problem revealing the fi?nal state of fast conversions that has eluded the community for almost two decades with two fundamentally new physical insights, viz., coarse-grained evolution and transverse relaxation.

Speaker: Mr Soumya Bhattacharyya (TIFR, Mumbai)

DOI # 10.5281/zenodo.4704999

INSPIRE LINK

ORCID LINK

Soumya_Bhattacharyya_TLK_866_748.pdf

The link for the PRL paper

12:25 PM Discussion Time

https://mediaspace.unipd.it/media/XIX+International+Workshop+on+Neutrino+Telescopes+- +Parallel+Room+2/1_1vlcxx4w?st=8850&ed=9040

11:35 AM → 12:30 PM Non Standard Interactions: (Room 3)

Conveners: Francesco D'Eramo (PD), Giuseppina Salente (PD)

11:35 AM Enhanced violation of Leggett-Garg Inequality in three flavour neutrino oscillations via non-standard interactions

Neutrino oscillations occur due to non-zero masses and they are believed to maintain quantum coherence even over astrophysical length scales.It is thus natural to explore geometric aspects of the phases involved as well as think about quantification of the coherence properties of neutrinos via temporal correlations in the form of Leggett-Garg Inequalities (LGI). In this paper, we study the quantumness of three flavor neutrino oscillations by studying the extent of violation of LGI if non-standard interactions are taken into account. We report an enhancement in violation of LGI with respect to the standard scenario for certain choice of NSI parameters.

Speaker: Sheeba Shafaq (Jawaharlal Nehru University)

DOI # 10.5281/zenodo.4672359

nutel_venice_shafaq.pdf

video

11:40 AM Radiative decays of charged leptons as constraints of leptonic unitarity

We calculate the rates of radiative $\beta^- \to \alpha^- + \gamma$ decays for $(\alpha, \beta) = (e, \mu)$, $(e, \tau)$ and $(\mu, \tau)$ by taking the {\it unitary} gauge in the $(3+n)$ active-sterile neutrino mixing scheme, and make it clear that constraints on the unitarity of the $3\times 3$ Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix $U$ extracted from $\beta^- \to \alpha^- + \gamma$ decays in the {\it minimal unitarity violation} scheme differ from those obtained in the canonical seesaw mechanism with $n$ heavy Majorana neutrinos by a factor $5/3$. In such a natural seesaw case we show that the rates of $\beta^- \to \alpha^- + \gamma$ can be used to cleanly and strongly constrain the effective apex of a unitarity polygon, and compare its geometry with the geometry of its three sub-triangles formed by two vectors $U^{}_{\alpha i} U^*_{\beta i}$ and $U^{}_{\alpha j} U^*_{\beta j}$ (for $i \neq j$) in the complex plane. We find that the areas of such sub-triangles can be described in terms of the Jarlskog-like invariants of CP violation ${\cal J}^{ij}_{\alpha\beta}$, and their small differences signify slight unitarity violation of the PMNS matrix $U$.

Speaker: Di Zhang (Institute of High Energy Physics, CAS)

DOI # 10.5281/zenodo.4671992

NeuTel2021-DiZhang.pdf

video

11:45 AM Constraints on neutrino non-standard interactions: From neutrino oscillations to precision cosmology

Neutrino non-standard interactions (NSIs) have been actively investigated both theoretically and experimentally in the past. Yet null signals of any new physics at colliders and from low-energy precision measurements have gradually motivated the investigation of new physics model-independently. Effective Field Theories (EFTs) provide such a systematic and model-independent framework. In this talk, working within the EFT framework, I will present our recent results on both neutral- and charge-current neutrino NSIs from neutrino oscillation experiments [1] and precision cosmology [2].

Refs:
[1] https://arxiv.org/abs/2011.14292
[2] https://arxiv.org/abs/2101.10475

Speaker: Yong Du (ITP CAS)

DOI # 10.5281/zenodo.4672553

video

XIX-neutrino-telescopes_YongDu.pdf

11:50 AM A closer look at the pp-chain reaction in the Sun: Constraining the coupling of light mediators to protons

In this talk, I will explore a surprising connection between speculative issues in elementary particle physics and the Sun. I will show how the extreme sensitivity of nuclear reaction Coulomb barrier penetration at the low energies of the solar core and the recent observation of the CNO neutrinos from the Sun by the Borexino collaboration could be leveraged to probe aspects of the non-standard interactions involving light mediators recently invoked to explain anomalies in short baseline neutrino experiments. Moreover, with an improved determination of solar metallicity, and a more precise measurement of the CNO flux it is very likely that our limits on the mass and the coupling of the non-standard mediators will improve even more.

Speaker: Anna M. Suliga (Niels Bohr Institute)

arXiv: 2012.11620

DOI # 10.5281/zenodo.4672536

Suliga.pdf

video

11:55 AM Discussion Time

12:05 PM Constraints on neutrino electromagnetic properties from COHERENT elastic neutrino-nucleus scattering

Neutrino electromagnetic properties are import windows in neutrino physics to go beyond the Standard Model. The coherent elastic neutrino-nucleus scattering process is a powerful probe of the neutrino electromagnetic properties, which was first observed in 2017 at the COHERENT experiment by the cesium-iodide (CsI) detector and later in 2020 at the argon (Ar) detector.
In this talk, we present the constraints of neutrino electromagnetic properties from COHERENT CsI and Ar data, including the neutrino charge radii, millicharges and magnetic moments. The combined CsI and Ar limits are also obtained, and compared with other experimental results. We show that the COHERENT data can provide competitive constraints of the neutrino charge radii, in particular for the muon neutrino related components.

Speaker: Yiyu Zhang

DOI # 10.5281/zenodo.4671908

NeuTel_Yiyu.pdf

video

12:10 PM Neutrino physics in extended theories of gravity

In this talk, I summarize the investigation revolving around neutrino physics within the framework of extended theories of gravity. By relying on the covariant reformulation of Pontecorvo’s formalism, one can evaluate the oscillation probability of neutrinos propagating in static spacetimes described by gravitational actions quadratic in the curvature invariants. In particular, it is shown that neutrino oscillations are sensitive to the violation of the strong equivalence principle (SEP) in such a way that the aforesaid occurrence leads to phenomenologically testable implications. Indeed, it is possible to check that the parameter quantifying SEP directly appears in the expression of the oscillation phase, and as long as this correction is non-vanishing the flavor transition probability is different from the flat case.

By way of illustration, I specialize the above study to specific extended theories of gravity in order both to quantify SEP violation and to understand how the characteristic free parameters of these models affect the neutrino phase. In passing, the possibility to fix new bounds on these parameters (and hence to constrain extended theories of gravity) is also discussed.

Speaker: Dr Luciano Petruzziello (Università degli Studi di Salerno & INFN Gruppo di Napoli)

DOI # 10.5281/zenodo.4672416

Petruzziello talk.pdf

Petruzziello talk.pptx

video

Video

12:15 PM Constraints on light vector mediators through COHERENT data

The observation of coherent elastic neutrino-nucleus scattering performed by the COHERENT experiment with cesium iodide in 2017 and with liquid argon in 2020, represents an innovative and powerful tool for investigating non-standard interactions not included in the Standard Model and interactions mediated by yet to be discovered light neutral vector bosons.
We present new constraints on three different models of light mediators, namely universal, B-L and Lµ − Lτ models, involving a light vector Z’ mediator, by exploiting the data recently released by the COHERENT Collaboration. We compare the results obtained from a combination of the cesium-iodide and argon data sets with the limits obtained by other experiments, and with the parameter region that could explain the anomalous magnetic moment of the muon.

Speaker: Emmanuele Picciau (CA)

DOI # 10.1007/JHEP01(2021)116

Neutrino_Telescope_Emmanuele_Picciau.pdf

video

Video

12:20 PM Discussion Time (https://mediaspace.unipd.it/media/XIX+International+Workshop+on+Neutrino+Telescopes+-+Parallel+Room+3/1_veep324y?st=1140)

2:00 PM → 3:10 PM Commemorations

Convener: Mauro Mezzetto (PD)

2:00 PM Commemoration of Masatoshi Koshiba

Speaker: Atsuto Suzuki

Commemoration Session

NeutrinoSuzuki.mp4

Retrospective.pdf

2:30 PM Commemoration of Samoil Bilenky

Speaker: Serguey Petkov (TS)

Commemoration Session

PetcovSMBilenkyNuTel19022021v2f.pdf

2:50 PM Commemoration of Jack Schneps

Speaker: Alexandre Sousa

Commemoration Session

Jack_Schneps_Celebration_Sousa_Neutel_2021.pdf

3:10 PM → 3:25 PM Coffee Break

3:25 PM → 4:55 PM Challenge

Convener: Chiara Sirignano (PD)

3:25 PM Neutrino Beta Decay and Neutrino Coherent Scattering: Examples of Neutrino Physics at Ultra-Low Energy Scales

Speaker: Joseph Formaggio (Massachusetts Institute of Technology)

DOI # 10.5281/zenodo.4704427

Formaggio NeuTel 2021.pdf

3:55 PM Theoretical challenges of neutrino masses and mixings

Speaker: Kopp Joachim (JGU)

DOI # 10.5281/zenodo.4704468

neutrino-challenges_Kopp_Last.pdf

4:25 PM Multimessenger fingerprint of Dark Matter

Speaker: Gianfranco Bertone (ITP, Zurich & IAP, Paris)

Bertone_Venice_Neutrino_2021.pdf

DOI # 10.5281/zenodo.4704390

4:55 PM → 5:10 PM Coffee Break

5:10 PM → 6:10 PM Cross Sections: (Room 1)

Conveners: Chiara Sirignano (PD), Christian Farnese (PD)

5:10 PM ANNIE Phase II: Experiment Overview and first data

The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton Gd-doped water Cherenkov detector installed in the Booster Neutrino Beam (BNB) at Fermilab. The primary physics goal of ANNIE is to measure the neutron yield from νμ interactions as a function of Q2 in order to constrain neutrino-nucleus interaction theoretical models. Identifying and counting final state neutrons provides a new experimental handle to study systematic uncertainties related to the neutrino energy reconstruction in oscillation experiments. To achieve that goal ANNIE will make the first use of the novel Large Area Picosecond Photodetectors (LAPPDs) and demonstrate the feasibility of this technology as a new tool in physics experiments. In this talk we present an overview of the experiment and the first beam commissioning and calibration data.

Speaker: Dr Evangelia Drakopoulou (University of Edinburgh)

ANNIE Phase II: Experiment Overview and first data

ANNIE_NeuTel2021.pdf

DOI # 10.5281/zenodo.4668542

5:30 PM Neutrino Interaction Results from MINERvA

MINERvA is a neutrino scattering experiment at Fermilab that utilizes the intense neutrino beam from the NuMI beamline and a finely segmented scintillator-based tracking detector to measure neutrino cross sections and study nuclear effects with various nuclear targets. MINERvA has results using both its low- energy and medium energy data sets. These results cover both exclusive and inclusive channels off multiple nuclei for muon neutrinos and anti-neutrinos and will benefit long-baseline neutrino oscillation experiments that require this precise understanding of neutrino-nucleus interactions. A summary of recent results from MINERvA will be presented.

Speaker: Mr Kang Yang (University of Oxford)

DOI # 10.5281/zenodo.4670193

NeuTel 2021 Minerva.pdf

Neutrino Interaction Results from MINERvA

5:50 PM Recent neutrino cross-section results from MicroBooNE

MicroBooNE is a liquid argon time projection chamber that operates in the Booster Neutrino Beam at Fermilab. The detector provides high-resolution imaging of neutrino interactions with a low threshold and full angular coverage. Thanks to a high expected event rate and several years of continuous operation, the MicroBooNE collaboration has obtained the world's largest dataset of neutrino-argon scattering events. A detailed understanding of these interactions, especially the impact of nuclear physics effects, will be critical to the success of future precision neutrino oscillation efforts, particularly the argon-based Deep Underground Neutrino Experiment (DUNE) and the Short-Baseline Neutrino (SBN) program. This talk presents an overview of the latest neutrino-argon cross section measurements in MicroBooNE. Particular emphasis is given to recent studies of charged-current interactions leading to final states containing zero pions and one or more protons.

Speaker: Krishan Mistry

DOI # 10.5281/zenodo.4668696

KM_RecentCrossSectionResultsMicroBooNE.pdf

Recent neutrino cross-section results from MicroBooNE

5:10 PM → 6:10 PM Low Energy Neutrinos: (Room 2)

Conveners: Andrea Longhin (PD), Fabio Pupilli (PD)

5:10 PM Imaging the Galctic Core with a Neutrino Gravitational Lens of our Sun

While the galactic core is 25,000 light years away but the number of stars there is immense making it the 2nd brightest neutrino source in the sky other than our Sun. The collection power of a gravitational Lens using our Sun is the most efficient way to focus this and unlike the light gravitational lens at 500 AU since the neutrino has mass its expected location is 20 to 40 AU, reachable with current and future planned NASA deep space probes. We are developing ways to make a neutrino gravitational lens to both image the galactic core in stellar neutrinos, and also this can be a new way to measure the mass of the neutrino.

Speaker: Prof. Nickolas Solomey (Wichita State University)

DOI # 10.5281/zenodo.4704779

Imaging the Galctic Core with a Neutrino Gravitational Lens of our Sun

Solomey NGF at Neutrino Telescope Conference INFN.pdf

Solomey Presentation Neutrino Telescope Confereence.mp4

5:30 PM Recent results from the Sudbury Neutrino Observatory experiment

The Sudbury Neutrino Observatory experiment (SNO) has performed a variety of measurements of neutrino and cosmic ray interactions, including the first observation of solar neutrino flavor change that confirmed that neutrinos have mass. Several new analyses using the SNO dataset collected between 1999 and 2006 have recently been completed, including tests of Lorentz invariance, constraints on neutrino lifetime, measurements of atmospheric neutrino– and muon-induced neutron production, and searches for $hep$ solar neutrinos and the diffuse supernova neutrino background (DSNB). We will discuss these results with an emphasis on the most recent $hep$ and DSNB analysis, and comment on ongoing work.

Speaker: Andrew Mastbaum (Rutgers University)

20210219_mastbaum-sno.pdf

DOI # 10.5281/zenodo.4704578

Recent results from the Sudbury Neutrino Observatory experiment

5:50 PM The observation of a neutrino from the Tidal Disruption Event AT2019dsg: a concordance model

We present a phenomenological concordance scenario with a relativistic jet for the Tidal Disruption Event (TDE) AT2019dsg, which has been proposed as source of the astrophysical neutrino event IceCube-191001A. Noting that AT2019dsg is one of the brightest (and few) TDEs observed in X-rays, in our work we connect the neutrino production with the X-rays: an expanding cocoon causes the progressive obscuration of the X-rays emitted by the accretion disk, while at the same time it provides a sufficiently intense external target of back-scattered X-rays for photo-pion production off protons. We also describe the late-term emission of the neutrino (about 150 days after the peak), by scaling the production radius with the black body radius. Our energetics and assumptions for the jet and the cocoon are compatible with expectations from numerical simulations of TDEs. About 0.26 neutrino events are predicted in the right energy range in IceCube.

Speaker: Cecilia Lunardini

DOI # 10.5281/zenodo.4705115

tde_slides_NeuTel2021.pdf

The observation of a neutrino from the Tidal Disruption Event AT2019dsg: a concordance model

5:10 PM → 6:10 PM Non Standard Interactions: (Room 3)

Conveners: Francesco D'Eramo (PD), Mauro Mezzetto (PD)

5:10 PM Dark Matter through the Neutrino Portal

We study the connection between the two indications of physics beyond the Standard Model (SM): the masses and mixing of neutrinos and the existence of dark matter (DM). The most attractive proposal for the origin of neutrino mass, the type I seesaw mechanism, can also account for matter-antimatter asymmetry via leptogenesis. We show that a minimal extension of type I seesaw models can also provide a portal to dark matter. As a concrete example, we study a minimal type I seesaw model with a right-handed neutrino portal to a minimal dark sector containing the dark matter candidate particle. In the minimal model, the parameters of the seesaw sector are fixed by neutrino oscillation data and leptogenesis. With the seesaw parameters fixed, we explore the portal and dark parameters required to obtain the observed DM relic abundance. Within this framework, we show how DM may be directly related to neutrino physics.

Speaker: Bowen Fu (University of Southampton)

DM_NP.pdf

DOI # 10.5281/zenodo.4671546

video

5:30 PM Minimal scoto-seesaw mechanism for neutrino masses with spontaneous CP violation

I will discuss our recent work on a simple scoto-seesaw model that accounts for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $\mathcal{Z}_8$ discrete symmetry, broken to a residual $\mathcal{Z}_2$ subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $\mathcal{Z}_8$ symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments.

Speaker: D. Barreiros (CFTP/IST, U.Lisboa)

backup_Barreiros_IWNT2021.mp4

Barreiros_IWNT_proceedings.pdf

DOI # 10.5281/zenodo.4671451

Minimal scoto-seesaw mechanism with spontaneous CP violation

video

5:50 PM Exploring the leptonic CP-violation in the presence of a light sterile neutrino

Determining the leptonic CP-violation is one of the main objectives of the neutrino oscillation experiments. Long-baseline (LBL) experiments are expected to play a crucial role in this direction. Two LBL experiments T2K and NO$\nu$A are already playing a leading role in addressing this issue. Apart from this, a few highly sophisticated LBL experiments like DUNE, T2HK, and ESS have also been planned to address this issue as well as the remaining unknown issues. In this talk, I will explore the current status and future prospects of discovering the leptonic CP-violation in the current and future LBL experiments in presence of an eV-scale light sterile neutrino.

Speaker: Dr Sabya Sachi Chatterjee (Institute for Particle Physics Phenomenology, Durham University)

DOI # 10.5281/zenodo.4672392

NuTelescopes2021-Sabya.pdf

video

Saturday, February 20

8:00 AM → 8:30 AM Pause: weekend break

The conference goes on break on Saturday and Sunday. It will continue on Monday 22nd

Sunday, February 21

8:00 AM → 8:30 AM Pause: weekend break

The conference goes on break on Saturday and Sunday. It will continue on Monday 22nd

Monday, February 22

10:00 AM → 11:20 AM Astrophysical Models: (Room 2)

Conveners: Chiara Sirignano (PD), Mathieu Lamoureux (INFN Padova)

10:00 AM IceCube constraints on Violation of Equivalence Principle

We analyze the effects of a Violation of Equivalence Principle (VEP) on neutrino oscillations, focusing on the recently released IceCube data on atmospheric neutrino fluxes. We obtain the strongest constraints up to date on the parameter space of VEP in the context of neutrino physics with a benchmark choice for the coupling between neutrinos and gravitational field. We also study the effect of VEP on the flavor composition of astrophysical neutrinos, stressing the interplay with the basis in which VEP is diagonal. We find that for some choices of such basis the flavor ratio measured by IceCube can probe VEP and we compare with the sensitivities of IceCube-Gen2 as well.

Speaker: Damiano F. G. Fiorillo (Università di Napoli "Federico II")

DOI # 10.5281/zenodo.4749327

IceCube constraints on Violation of Equivalence Principle

VEP Slides Revised.pdf

10:20 AM Active galactic nuclei as neutrino sources: from IceCube to radio neutrino telescopes

Active galactic nuclei (AGN) are among the most promising neutrino source candidates, because of their potential to accelerate cosmic rays and also because of the dense photon fields present in their relativistic jets. In support of this hypothesis, IceCube has already observed several high-energy events from the direction of known blazar AGN like TXS 0506+056 and, more recently, PKS 1502+106. Through numerical modeling, we can show that these individual IceCube events can be explained through photohadronic interactions of cosmic rays accelerated in the jet up to ~PeV energies. These same interactions can self-consistently reproduce the multi-wavelength spectra observed simultaneously to those neutrino events. By applying the same model to the entire AGN population, I will show that the diffuse IceCube flux can, under certain conditions, be fully explained by this source class, specifically from the sub-class of low-luminosity BL Lacs. On the other hand, it is also possible that AGN accelerate cosmic rays up to ultra-high (~EeV) energies. In this case, detailed modeling shows that the AGN population can account for the entire observed spectrum of ultra-high-energy cosmic rays, while obeying the current IceCube stacking limits in the PeV regime. We can then expect potentially large amounts of EeV neutrinos, produced both in the source and during propagation (cosmogenic). I will argue that the flux of EeV neutrinos produced inside AGN jets can in fact outshine the cosmogenic contribution, a conclusion that has important implications for the search strategy of future radio neutrino telescopes.

Speaker: Dr Xavier Rodrigues (DESY)

Active galactic nuclei as neutrino sources: from IceCube to radio neutrino telescopes

DOI # 10.5281/zenodo.4749314

talk210223.pdf

10:40 AM Neutrinos and UHECR from GRB internal shock scenarios

Gamma-Ray Bursts (GRBs) are among the brightest transients in our universe. Given the large amount of energy they release they have been long discussed as sources of ultra-high-energy cosmic rays (UHECR) - A hypothesis which is challenged by current IceCube neutrino limits. Assuming GRBs to power the UHECR flux, we study different engine realisations in multi-collision internal shock models and compute the in-source UHECR composition required to fit the observed spectra. Explicitly calculating the corresponding prompt and cosmogenic neutrino fluxes for the different scenarios, we show how (future) experiments might be used to discriminate between different scenarios and which parameter space is ruled out by neutrino observations.

Speaker: Annika Rudolph (DESY Zeuthen)

DOI # 10.5281/zenodo.4749178

Neutrinos and UHECR from GRB internal shock scenarios

NeutrinoTelescopes_Nu_UHECR_GRBs_AnikaRudolph.pdf

11:00 AM On the detectability of cosmogenic neutrinos

Ultra-high-energy cosmic rays (UHECRs) interact with pervasive photons during propagation. These interactions produce neutrinos, which can provide valuable insights on the elusive sources of UHECRs as well as on the composition of the highest-energy radiation. In this talk I will present realistic predictions for this cosmogenic flux, obtained through fits to UHECR measurements. In light of these results, I will discuss the prospects for detecting cosmogenic neutrinos with current and next-generation neutrino telescopes.

Speaker: Rafael Alves Batista (Radboud University)

DOI # 10.5281/zenodo.4749292

On the detectability of cosmogenic neutrinos

RAB-NuTel-21.pdf

10:00 AM → 11:20 AM Data Science and Detector R&D: (Room 3)

Conveners: Francesco D'Eramo (PD), Gianmaria Collazuol (PD)

10:00 AM 3D segmented plastic scintillator neutrino detector for T2K experiment

The T2K neutrino experiment in Japan started data taking in 2010 and obtained a first indication of CP violation in neutrino oscillations. To obtain better sensitivity, T2K will accumulate more statistics with a higher intensity beam and an upgraded near detector. The upgraded off-axis near detector (ND280) will allow us to reduce systematic uncertainties in the number of predicted events at Super-Kamiokande and to constrain the neutrino interaction cross section models. The upgraded detector will have the full polar angle coverage for muons produced in neutrino charged current interactions, a low threshold for proton detection and will be able to measure neutrons using time-of-flight due to a good timing performance. Thanks to these new capabilities, the upgrade of ND280 will measure the energy spectra of muon neutrinos and antineutrinos with an unprecedented level of accuracy, and the near-to-far detector extrapolation of systematics constrains will be much less model dependent and therefore more reliable.
A novel 3D highly granular scintillator detector called SuperFGD of a mass of about 2 tons was adopted as an upgraded ND280 fully-active neutrino target and a 4\pi detector of charged particles from neutrino interactions. It will consist of about two millions of small optically-isolated plastic scintillator cubes with a 1 cm side. Each cube is read out in the three orthogonal directions with wave-length shifting fibers coupled to compact photosensors, micro pixel photon counters. Several SuperFGD prototypes tested in beams with charged particles and neutrons demonstrated good performance. It is planned that SuperFGD installed into the ND280 magnet will be ready to accept the beam in December 2022. In this talk, the results of the beam tests of the SuperFGD prototypes, obtained parameters and current status of the detector construction will be reported. The physics program of SuperFGD and its ability for further reduction of largest systematic uncertainties in oscillation analysis based on realistic assumptions extracted from the present T2K results will be described.

Speaker: Marat Khabibullin (INR RAS)

DOI # 10.5281/zenodo.4773215

marat-nu-telescopes-2021-zendo.pdf

Video

10:20 AM Atmospheric Neutrino Physics with JUNO

The atmospheric neutrino flux represents a continuous source that can be exploited to infer properties about Cosmic Rays and neutrino oscillation physics. The JUNO observatory, a 20 kt liquid scintillator (LS) currently under construction in China, will be able to detect atmospheric neutrinos down to lower energies, with respect to Cherenkov detectors, given the large fiducial volume and the high light yield. The light produced in neutrino interactions with the LS will be collected by a double-system of photosensors: 18.000 20" PMTs and 25.000 3" PMTs. The LS detector is surrounded by a Cherenkov water pool, equipped with 2.400 20" PMTs, which is designed to reject atmospheric muons with high efficiency. The rock overburden above the experimental hall is around 700 m and the experiment is expected to see the first data in 2022.
In this work, potential JUNO measurements in the field of atmospheric neutrinos are evaluated. A sample of Monte Carlo events has been generated from theoretical models of the atmospheric neutrino flux, through the GENIE software. To evaluate the JUNO performances, the events have been processed by a full GEANT4 - based simulation, which propagates all the particles and the light inside the detector. The different time evolution of light on the PMTs allows to discriminate the flavor of the primary neutrinos. To reconstruct the time pattern of events, the signals from 3" PMTs only have been used, because of the excellent time resolution. A probabilistic unfolding method has been used, in order to infer the primary neutrino energy spectrum by looking at the detector output. JUNO will be particularly sensitive in the energy range (100-1000) MeV, where neutrino-induced events can be fully contained within the instrumented volume. The energy region is particularly interesting, for several reasons: first, the flavor oscillation effects due to the large neutrino mass-splitting are maximized; then, the region covers an area of interest for other studies too, like the search for nucleon decay and relic supernovae neutrinos.

Speaker: Dr Giulio Settanta (Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2, Jülich, Germany)

DOI # 10.5281/zenodo.4773278

Settanta_AtmosphericJUNO_NeuTel21.pdf

Video

10:40 AM Directional Dark Matter Search with NEWSdm

In spite of the extensive search for the detection of the dark matter (DM), experiments have so far yielded null results: they are probing lower and lower cross-section values and are touching the so-called neutrino floor. A way to possibly overcome the limitation of the neutrino floor is a directional sensitive approach: one of the most promising techniques for directional detection is nuclear emulsion technology with nanometric resolution. The NEWSdm experiment, located in the Gran Sasso underground laboratory in Italy, is based on novel nuclear emulsion acting both as the Weakly Interactive Massive Particle (WIMP) target and as the nanometric-accuracy tracking device. This would provide a powerful method of confirming the Galactic origin of the dark matter, thanks to the cutting-edge technology developed to readout sub-nanometric trajectories. In this talk we discuss the experiment design, its physics potential, the performance achieved in test beam measurements and the near-future plans. After the submission of a Letter of Intent, a new facility for emulsion handling was constructed in the Gran Sasso underground laboratory which is now under commissioning. A Conceptual Design Report is in preparation and will be submitted in Summer 2021.

Speaker: Valeri Tioukov (NA)

2021.02-NeuTel-V.Tioukov.pptx

DOI # 10.5281/zenodo.4773052

Video

11:00 AM Novel LiquidO Neutrino Detection Technology

Upon the neutrino discovery by Reines & Cowan (1956), they also paved the ground behind much of today’s neutrino detection technology. Large instrumented volumes for neutrino detection have been achieved via a key (implicit) principle: detection medium transparency and/or high purity. Much of that technology has yielded historical success, including several Nobel prizes, where the discovery of the neutrino oscillation phenomenon is the latest example. Despite the stunning success, the “transparent technology” like the pioneering liquid scintillator detectors are known to suffer from key limitations such as little (or no) topological particle identification (PID) ability, typically enabling active background rejection. Solving this while keeping the detector scalability has long remained one of the main challenges in the field. Still today, many of those otherwise overwhelming backgrounds can only be reduced via an expensive passive shielding strategy, including the advent for deep underground laboratories. In this talk, we will introduce the novel LiquidO technology (released since mid-2019 by an international proto-collaboration and still under active R&D) whose rationale exploits detection medium extreme opacity, thus breaking with the need for transparency, to yield unprecedented event-wise PID which may reduce dramatically the need for passive shielding.

Speaker: Dr Anatael Cabrera (CNRS IJCLab / LNCA)

DOI # 10.5281/zenodo.4773134

LiquidO@NeuTel2021-Anatael-Feb2021.pdf

Video

10:00 AM → 11:20 AM Neutrinos at Colliders: (Room 1)

Conveners: Christian Farnese (PD), Marco Grassi (University of Padova - INFN)

10:00 AM The Scattering and Neutrino Detector at the LHC

SND@LHC is a proposed, compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in an hitherto unexplored pseudo-rapidity region of 7.2<$\eta$<9.6, complementary to all the other experiments at the LHC. The experiment is to be located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on an 800 kg target mass of tungsten plates, interleaved with emulsion and electronic trackers, followed downstream by a muon system. The configuration allows efficiently distinguishing between all three neutrino flavours, opening a unique opportunity to probe physics of heavy flavour production at the LHC in the region that is not accessible to ATLAS, CMS and LHCb. The detector concept is also well suited to searching for Feebly Interacting Particles via signatures of scattering in the detector target. The first phase aims at operating the11detector throughout LHC Run 3 to collect a total of 150 fb$^{−1}$.

Speaker: Antonia Di Crescenzo (NA)

2021_02_22_DiCrescenzo_SND@LHC.pdf

DOI # 10.5281/zenodo.5507399

The Scattering and Neutrino Detector at the LHC

10:20 AM Neutrino Physics with the SHiP experiment

The SHiP Collaboration has proposed a general-purpose experimental facility operating in beam dump mode at the CERN SPS accelerator with the aim of searching for light, long-lived exotic particles of Hidden Sector models. The SHiP experiment incorporates a muon shield based on magnetic sweeping and two complementary apparatuses.
The detector immediately downstream of the muon shield is optimised both for recoil signatures of light dark matter scattering and for tau neutrino physics. The second one aims at measuring the visible decays of hidden sector particles to both fully reconstructible final states and to partially reconstructible final states with neutrinos, in a nearly background free environment.
Using the high-intensity beam of 400 GeV protons, the experiment is capable of integrating 2 x 10ˆ20 protons in five years, which allows probing heavy neutrinos with GeV-scale masses at sensitivities that exceed those of existing and projected experiments. The sensitivity to light dark matter reaches well below the elastic scalar Dark Matter relic density limits in the range from a few MeV/cˆ2 up to 200 MeV/cˆ2. The tau neutrino deep-inelastic scattering cross-sections will be measured with a statistics a thousand times larger than currently available, with the extraction of the F4 and F5 structure functions, never measured so far.
An overview of the SHiP neutrino program will be reported at this conference.

Speaker: Alessandra Pastore (BA)

DOI # 10.5281/zenodo.5507439

Neutrino Physics with the SHiP experiment

Pastore_SHiP_NeuTel2021.pdf

10:40 AM Heavy neutrino searches at the FCC

The Future Circular Collider (FCC) is proposed as a post-LHC particle collider at CERN and consists of different steps. The first step of the FCC (FCC-ee) is a high-luminosity, high-precision lepton collider located in the same tunnel as a possible precursor to a hadron collider, and complementary to it. The ultimate goal, FCC-hh, is a 100 TeV hadron collider, colliding protons and heavy-ions, with a center of mass energy seven times that of the LHC, an energy step similar to the one from the Tevatron to the LHC. A hadron-lepton collider (FCC-eh), operating with the FCC-hh, could be the finest microscope for studying quark-gluon interactions and possible further substructure of matter.

One of the most interesting searches that will be possible at the FCC concerns heavy neutrinos, or heavy neutral leptons. These hypothetical new particles hold an incredible potential, since they could provide answers to many interesting open questions in the standard model (SM) of particle physics, from neutrino masses to the matter-antimatter imbalance of the Universe, including offering a plausible Dark Matter candidate.

At the FCC (ee, hh, eh) a large parameter space will be within reach for Heavy Neutrinos. The FCC-ee running at the Z-Pole will be unbeatable: heavy neutrino produced in Z decays with low-mixing with the regular neutrinos, all the way to the domain of type-1 seesaw models, could give rise to characteristic, and essentially background free, long-lived signatures in the detectors. When the decay lengths of these new particles is long enough, neutrino oscillations might even be studied, and offer limited sensitivity for tests of Lepton Number Violation. The initial state flavor and charge is known at FCC-hh and FCC-eh, and therefore they will offer tests of lepton-flavor violation and Lepton Number violation in a domain of somewhat larger mixing angles.

This is the right time to start benchmarking the most interesting physics process to study at the different phases of the FCC, exploring the corresponding detector requirements; during this process heavy neutrinos will take a central stage. The complementarity of the three different stages of the FCC provides unique potential to discover and pin down these particles, and maybe solving long-standing problems of the SM. This talk will describe the current landscape and possible areas to contribute to in the next years.

Speaker: Dr Rebeca Gonzalez Suarez (Uppsala University)

DOI # 10.5281/zenodo.5507451

Heavy neutrino searches at the FCC

Telescopes2021_RGS.pdf

11:00 AM Probing LFV in an effective theory at ep colliders

We investigate the sensitivity of electron-proton (ep) colliders for charged lepton flavor violation (cLFV) in an effective theory approach, considering a general effective Lagrangian for the conversion of an electron into a muon or a tau via the effective coupling to a neutral gauge boson or a neutral scalar field. For the photon, the Z boson and the Higgs particle of the Standard Model, we present the sensitivities of the LHeC for the coefficients of the effective operators, calculated from an analysis at the reconstructed level. As an example model where such flavor changing neutral current (FCNC) operators are generated at loop level, we consider the extension of the Standard Model by sterile neutrinos. We show that the LHeC could already probe the LFV conversion of an electron into a muon beyond the current experimental bounds, and could reach more than an order of magnitude higher sensitivity than the present limits for LFV conversion of an electron into a tau. We discuss that the high sensitivities are possible because the converted charged lepton is dominantly emitted in the backward direction, enabling an efficient separation of the signal from the background.

Speaker: Ahmed Hammad (Basel University)

DOI # 10.5281/zenodo.5507414

LFV_effV.pdf

Probing LFV in an effective theory at ep colliders

Probing LFV in an effective theory at ep colliders

record.mp4

11:20 AM → 11:35 AM Coffee Break

11:35 AM → 12:25 PM Astrophysical Models: (Room 2)

Conveners: Elisa Bernardini (Padova), Mathieu Lamoureux (INFN Padova)

11:35 AM Photohadronic modelling of the 2010 gamma-ray flare from Mrk 421

Blazars are a subclass of active galactic nuclei (AGNs) that have a relativistic jet with a small viewing angle towards the observer. Recent results based on hadronic scenarios have motivated an ongoing discussion of how a blazar can produce high energy neutrinos during a flaring state and which scenario can successfully describe the observed gamma-ray behavior. Markarian 421 (Mrk 421) is one of the closest and brightest objects in the extragalactic gamma-ray sky and showed flaring activity over a 14-days period in 2010 March. In this work, we describe the performed analysis of Fermi-LAT data from the source focused on the MeV range (100 MeV–1 GeV), and study the possibility of a contribution coming from the pγ interactions between protons and MeV SSC target photons to fit the very high energy (VHE) gamma-ray emission. The fit results were compared with two leptonic models (one-zone and two-zone) using the Akaike Information Criteria (AIC) test, which evaluates goodness-of-fit alongside the simplicity of the model. In all cases, the photohadronic model was favored as a better fit description in comparison to the one-zone leptonic model, and with respect to the two-zone model in the majority of cases. Our results show the potential of a photohadronic contribution to a lepto-hadronic origin of the gamma-ray flux of blazars. Future gamma-ray observations above tens of TeV and below 100 MeV in energy will be crucial to test and discriminate between models.

Speaker: Mr Alberto Rosales de Leon (Durham University)

DOI # 10.5281/zenodo.4749360

Photohadronic modelling of the 2010 gamma-ray flare from Mrk 421

XIX_NeuTel_2021_ARdL.pdf

11:40 AM A marginally fast-cooling proton-synchrotron model for prompt GRB emission

A small fraction of GRBs with available data down to soft X-rays ( ~0.5 keV) have been shown to feature a spectral break in the low energy part of their prompt emission spectrum. The overall spectral shape is consistent with optically thin synchrotron emission from a population of marginally fast cooling particles. If the radiating particles are electrons, this interpretation implies relatively weak magnetic fields and large emitting regions to limit, respectively, synchrotron and inverse Compton cooling. Both requirements are, however, in tension with the idea of a compact region producing the variable GRB prompt emission. In this work we consider the hadronic scenario and investigate the idea that the prompt emission originates from relativistic protons that radiate synchrotron in the marginally fast cooling regime. We compute the source parameters required for such a scenario to work and investigate how additional processes, namely photohadronic interactions and gamma-gamma pair production, contribute to the overall spectrum. We numerically compute the observed photon spectra and calculate the expected high-energy neutrino emission following the assumptions of this work.

Speaker: Ioulia Florou (National & Kapodestrian University of Athens)

A marginally fast-cooling proton-synchrotron model for prompt GRB emission

A marginally fast-cooling proton-synchrotron model for prompt GRBs.pdf

DOI # 10.5281/zenodo.4748769

11:45 AM Neutrino flavor conversions in binary neutron star merger remnants

Neutrinos are puzzling particles that could answer many of the open questions about our Universe. Unlike any other observed particle, the flavor of neutrinos can feedback into itself in a neutrino-dense astrophysical environment. Such neutrino self-interaction leads to intriguing “fast” flavor conversions that can develop within a few nanoseconds in the core of core-collapse supernovae and compact binary mergers. Inevitably, since neutrinos are copiously produced in the merger of two neutron stars, fast neutrino conversions are predicted to be ubiquitous in neutron star merger remnants with potentially major implications on the nucleosynthesis of the elements heavier than iron, and therefore on the related kilonova electromagnetic emission. We present the first multi-dimensional numerical modeling of the neutrino flavor evolution above the merger remnant disk and discuss the possible implications that neutrino flavor conversions could have on the associated kilonova observed at Earth.

In the work presented here, I have developed a new numerical framework to include neutrino conversions in a simplified model that resembles a binary neutron star merger remnant. Although an approximation, this model is the first multi-dimensional solution of such an astrophysical system that takes into account the detailed neutrino advection and neutrino flavor conversion physics that has not been explored in past studies. This work constitutes a major step forward in the exploration of the role of neutrinos in compact merger remnants. Our findings suggest that complete modeling of the neutrino flavor conversion physics should be taken into account in order to make robust predictions for the electromagnetic emission expected by the merger remnant and its aftermath.

Speaker: Ian Padilla Gay (University of Copenhagen - Niels Bohr Institute)

arxiv:2009.01843

DOI # 10.5281/zenodo.4749280

Neutrino flavor conversions in binary neutron star merger remnants

nutel_presentation.pdf

11:50 AM Invisible neutrino decay at KM3NeT-ORCA

Several theories of particle physics beyond the Standard Model consider that neutrinos can decay. I discuss the sensitivity of the upcoming neutrino telescope KM3NeT-ORCA to this scenario. I show that it could improve the current bounds coming from oscillation experiments, where three-neutrino oscillations have been considered, by roughly two orders of magnitude. I also discuss the robustness of the experiment to the standard oscillation parameters and the neutrino mass ordering in presence of invisible neutrino decay.

Speaker: Christoph Andreas Ternes (Istituto Nazionale di Fisica Nucleare)

DOI # 10.5281/zenodo.4749270

Invisible neutrino decay at KM3NeT-ORCA

nu_decay_ternes.pdf

11:55 AM Discussion Time

12:05 PM Reservoir Sources Contribution to the astrophysical Neutrino Flux

Starburst Galaxies are known as “reservoirs” of high-energy cosmic rays which potentially could contribute to the astrophysical diffuse neutrino flux measured by IceCube. In this work, we go beyond the standard prototype-based approach, and investigate a model based on a data-driven blending of spectral indexes, thereby capturing the observed changes in the properties of individual emitters. We then perform a multi-messenger analysis considering the extragalactic gamma-ray background (EGB) measured by Fermi-LAT and the IceCube data samples. Remarkably, we find that, the spectral index blending allows starburst galaxies to account for up to 40% of the HESE events at 95.4 % C.L., while satisfying the limit on the non-blazar EGB component. In broad terms, our analysis points out that a better modeling of astrophysical sources could alleviate the tension between neutrino and gamma-ray data interpretation.

Speaker: Antonio Ambrosone (Istituto Nazionale di Fisica Nucleare)

DOI # 10.5281/zenodo.4748908

neutelpresentationambrosone.pdf

Reservoir Sources Contribution to the astrophysical Neutrino Flux

12:10 PM Brightest Solar Flare Neutrino Astronomy in SK, HK and Icecube

Largest Solar Flare did burst on Earth hardest gamma photons of pion nature. The associated charged pion decay must also shine hard muon and electron neutrinos. Their detection and their flavor might be observable in largest present or future underground detectors if, at flare peak, they are overcoming the steady atmospheric noise. The present Super Kamiokande neutrino detector recently amplified by Gadolinium, might record, in years, the relic cosmic Supernovae noises at tens MeV energy; at same tens MeV energies, the brightest Solar neutrino flare might be observable by one or few events. Hyper Kamikande megaton will surpass the SK mass, better allowing a detection of Solar electron, muon anti-neutrino flare at tens and hundreds MeV. Finally the Icecube inner core, whose tens megaton volume and whose energy threshold might reach few or ten GeV ones, might also rarely record brightest neutrinos both of electron and muon nature possibly tracking also their solar arrival direction. Tau flavor neutrino presence by flight mixing is almost undetectable because soft solar flare spectra and the large tau mass threashold, but in principle it might be somehow observed.

Speaker: Dr Maxim Khlopov

Brightest Solar Flare Neutrino Astronomy in SK, HK and Icecube

DOI # 10.5281/zenodo.4748804

Khlopov_1615328706624_22-2-2021 - VENICE_SOLAR-NANO-UPDATED.pptx

12:15 PM Discussion Time

11:35 AM → 12:35 PM New Facilities: (Room 1)

Conveners: Andrea Longhin (PD), Christian Farnese (PD)

11:35 AM Study of SIPMs for the JUNO-TAO detector

The Taishan Antineutrino Observatory (JUNO-TAO) is a ton-level liquid scintillator detector at 30-35 meters from the Taishan reactor and it is a satellite detector of the JUNO Observatory.
It aims to measure the reactor neutrino spectrum and to provide model independent inputs for the neutrino mass hierarchy. To reach an energy resolution better than 2%, the scintillation light produced in the liquid scintillator is detected by about 4100 Silicon photomultipliers (SIPMs) having a >50% photon detection efficiency.
SIPMs should fit several requests: a low radioactivity, less than 4.4 Bq/kg, 6.3 Bq/kg and 1 Bq/kg for Uranium, Thorium and Potassium, respectively; high and uniform photon detection efficiency; a low value of dark noise at -50 °C, the operative temperature of the detector.
A R&D on SIPMs is in progress to find the best solution for the JUNO-TAO detector.
In this talk, an overview of the R&D will be reported with emphasis on the requirements of SIPMs and ongoing work related to their characterizations.

Speaker: Claudio Lombardo (Dipartimento di fisica ed Astronomia Università degli studi di Catania)

DOI # 10.5281/zenodo.5045980

Study of SIPMs for the JUNO-TAO detector

TAO_SiPMs_Neutel2021_Lombardo.pdf

11:40 AM JUNO OSIRIS Online Trigger

JUNO is a 20 kt liquid scintillator detector under construction in Jiangmen, China, whose goal is to determine the neutrino mass hierarchy. Decay of radioactive isotopes in the liquid scintillator can mimic neutrino signal events. In order to meet the stringent requirements on the radiopurity of the liquid scintillator in JUNO experiment, the OSIRIS pre-detector is being designed to monitor the liquid scintillator during the several months of filling the large volume of JUNO. OSIRIS will contain 20 ton of scintillator and will be equipped with 76 20-inch PMTs. The data acquisition system will have no global hardware trigger: instead, each PMT will provide a data-stream composed of the digitized PMT pulses, each containing a time stamp. Based on the latter, dedicated software will organize these data streams into events by sorting the time stamps and apply trigger logics. To optimize the trigger conditions, physics events are generated from the Geant4-based OSIRIS simulation software. Then the output of photon hits on all PMTs are transferred into our DAQ simulation software where dark counts are also simulated. Afterwards, different trigger conditions are applied in the event builder. This talk will discuss the final trigger setup as a function of $^{14}$C beta-decay event rate and dark rates of PMTs. Our goal is to achieve the optimal trade-off of maintaining a low dark noise event rate with a high trigger efficiency to detect $^{14}$C events.

Speaker: Mr Runxuan Liu (IKP-2, Forschungszentrum Jülich)

DOI # 10.5281/zenodo.5045635

JUNO OSIRIS Online Trigger

NeuTel_2021_RunxuanLiu_v2.pdf

11:45 AM Delta Rays: A Novel Calibration for the Deep Underground Neutrino Experiment (DUNE) for Low Energy Astrophysical Neutrinos

Future neutrino observatories, like the Deep Underground Neutrino Experiment (DUNE),
will be sensitive to supernovae and solar neutrinos of low energies. These neutrinos offer a unique
look inside stars and stellar explosions. Inside the DUNE liquid argon time projection chamber,
low-energy electron neutrinos will produce visible electrons. In this talk, we will present a
preliminary study of delta-rays that have similar energies to the electrons scattered by low-energy
astrophysical neutrinos. Unlike neutrinos, delta-rays are a well understood "standard candle."
Furthermore, they provide ample statistics, a valuable feature in the otherwise quiet underground
environment. We will outline how they can be used to calibrate DUNE's response to < 30 MeV
electrons in situ.

Speaker: Olexiy Dvornikov (University of Hawaii)

2021_Feb22_NeuTel_Delta_Talk_Alex.pdf

Delta Rays: A Novel Calibration for the Deep Underground Neutrino Experiment (DUNE) for Low Energy Astrophysical Neutrinos

DOI # 10.5281/zenodo.5045400

11:50 AM Measuring the proton-argon cross-section at ProtoDUNE-SP

Recent neutrino oscillation experiments have ushered in a new era with precisionmeasurements employed in the search for CP violation and mass hierarchy. The Deep UndergroundNeutrino Experiment (DUNE) is a next generation long-baseline neutrino experiment hosted by the U.S. Department of Energy's Fermilab. The single-phase liquid argon far-detector prototype (ProtoDUNE-SP) at the CERN neutrino platform is a critical milestone for the DUNE experiment. It serves as a prototype to validate the technology for the 10-kton fiducial mass liquid argon detectors for the DUNE experiment. The primary physics goal of ProtoDUNE-SP is to measure the hadron-argon cross-sections at unprecedented precision. ProtoDUNE-SP was exposed to a varietyof test-beam particles (protons, pions, kaons, muons, and electrons) in a broad range of momenta, from 0.3 - 7 GeV/c. This provides rich data to study the hadron-argon interactions in a liquid argondetector. In this talk, I will present our progress on the proton-argon cross-section measurement, including the selection of beam protons, space charge calibration, calorimetric reconstruction, and the latest update of the analysis.

Speaker: Dr Heng-Ye Liao (Kansas State University)

20210222_Neutel_HengYe.pdf

DOI # 10.5281/zenodo.5045480

Measuring the proton-argon cross-section at ProtoDUNE-SP

11:55 AM Discussion Time

12:05 PM Optimization of the Target Station for the ESSnuSB Project Using the Genetic Algorithm

The ESS neutrino Super Beam project (ESS$\nu$SB) aims at the production of an intense neutrino beam by using the 5 MW average power proton beam from the ESS facility currently under construction in Lund (Sweden). In the present work, we show the results of the Genetic Algorithm applied to the design of the ESS$\nu$SB target station. The impact of this optimization method on the physics reach of the experiment, especially on the precision which can be achieved in the measurement of the neutrino oscillation CP-violating phase $\delta_{CP}$, is discussed. The ESS$\nu$SB project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.

Speaker: Loris D'Alessi (IPHC, Université de Strasbourg, CNRS/IN2P3)

20210222_DAlessi_NeuTel2021.pdf

DOI # 10.5281/zenodo.5045417

Optimization of the Target Station for the ESSnuSB Project Using the Genetic Algorithm

12:10 PM Prospects of building an accelerator-based neutrino oscillation experiment in China

China is currently seeing a rise of underground laboratories and particle accelerators on its mainland. In this talk, we discuss the prospects of building a next-generation accelerator-based neutrino oscillation experiment by utilizing the laboratory sites that are available in China. We consider the potential candidates for the neutrino beam and detector facilities and examine their suitability to study CP violation and physics beyond the Standard Model in a neutrino oscillation experiment. As an example, we present a case study on an experimental configuration where an accelerator-based neutrino beam is produced at the injector chain of the Super Proton-Proton Collider while placing the neutrino detector in the China JinPing underground Physics Laboratory. Our findings highlight the importance of including a tau neutrino physics program in such an experiment.

Speaker: Sampsa Vihonen (Zhongshan University)

DOI # 10.5281/zenodo.5045762

Prospects of building an accelerator-based neutrino oscillation experiment in China

Prospects_of_A_Chinese_Experiment.pdf

12:15 PM Probing the second oscillation maximum at DUNE

After the successful experimental confirmation of the phenomenon of neutrino oscillation, the major goal of the neutrino experiments has mainly shifted to the search for leptonic CP-violation (CPV), determination of neutrino mass ordering and the precision measurement of the oscillation parameters.
Leptonic CPV, if it can be established, can offer a crucial ingredient in explaining the puzzle of the baryon asymmetry in the observed universe through an elegant mechanism called leptogenesis. Determination of mass ordering and precision measurements will shed light on the plausible set of models for neutrino mass generation. All these require the investigation of neutrino oscillation over a wide range of the ratio ($L/E$) of neutrino propagation length $L$ and neutrino beam energy $E$. This will help in gathering information over several oscillation maxima to search for the physics issues
mentioned above. Deep Underground Neutrino Experiment (DUNE) is a next generation long baseline experiment that is expected to see the second oscillation maximum (SOM) in addition to the first oscillation maximum (FOM). We discuss how at the SOM, the CP sensitivity can potentially become larger compared to that of FOM. We write a new $\Delta \chi^{2}$ code that estimates, for the first time in literature, the sensitivity of DUNE to probe the SOM in its projected data.

Speaker: Mehedi Masud (IBS-CTPU, Daejeon, Korea)

DOI # 10.5281/zenodo.5045912

Probing the second oscillation maximum at DUNE

slides_masud.pdf

12:20 PM Discussion Time

11:35 AM → 12:25 PM Non Standard Interactions and Cosmology: (Room 3)

Conveners: Fabio Pupilli (PD), Francesco D'Eramo (PD)

11:35 AM Preliminary study on the relative in-flight flux self-calibration for the Euclid NISP instrument

Euclid is a European Space Agency mission on satellite, whose aim is to investigate the so called “dark universe” (that is, dark matter and dark energy) and thus strongly constrain the main cosmological parameters, including the sum of neutrino masses. For this purpose, an extensive calibration of all the telescope elements is required. I’ve worked on the in-flight flux calibration procedure of the Euclid NISP spectrograph: the same sources in the sky, observed in different positions on the focal plane, are detected with a different number of counts because of the non-uniformity in the transmission of light introduced by the telescope internal optics. Simulations are needed to choose the best combination of observed sky area and pointings, so that the required accuracy on this self-calibration procedure can be reached. I’ll briefly illustrate the procedure we studied for this purpose and its preliminary results for a simplified scenario.

Speaker: Ilaria Risso (INFN Genova & Università degli Studi di Genova)

DOI # 10.5281/zenodo.4674450

nutelescopeirisso.pdf

Video

11:40 AM Phenomenological Advantages of the Normal Neutrino Mass Ordering

The preference of the normal neutrino mass ordering from the recent cosmological constraint and the global fit of neutrino oscillation experiments does not seem like a wise choice at first glance since it obscures the neutrinoless double beta decay and hence the Majorana nature of neutrinos. Contrary to this naive expectation, we point out that the actual situation is the opposite. The normal neutrino mass ordering opens the possibility of excluding the higher solar octant and simultaneously measuring the two Majorana CP phases in future 0ν2β experiments. Especially, the funnel region will completely disappear if the solar mixing angle takes the higher octant. The combined precision measurement by the JUNO and Daya Bay experiments can significantly reduce the uncertainty in excluding the higher octant. With a typical O(meV) sensitivity on the effective mass |mee|, the neutrinoless double beta decay experiment can tell if the funnel region really exists and hence exclude the higher solar octant. With the sensitivity further improved to sub-meV, the two Majorana CP phases can be simultaneously determined. Thus, the normal neutrino mass ordering clearly shows phenomenological advantages over the inverted one.

Speaker: Prof. Shao-Feng Ge (Tsung-Dao Lee Institute (TDLI), Shanghai Jiao Tong University)

210222_NuTel.pdf

DOI # 10.5281/zenodo.4674359

Video

11:45 AM Symmetry Breaking and Nuclear Effects in Hyperon Production

We study the properties of the Cabibbo suppressed quasielastic production of $\Lambda$ and $\Sigma$ hyperons in antineutrino interactions with nuclei using the NuWro Monte Carlo generator. Few events of this kind have been observed in previous experiments and the model is built exploiting the SU(3) quark flavour symmetry. We study the results of introducing symmetry breaking and the second class current into this model. Nuclear effects are included through final state interactions and a test potential affecting the hyperon. This potential reduces the inclusive hyperon production rate through reabsorption and a large fraction of $\Sigma$ baryons are converted to $\Lambda$ through reinteractions.

Speaker: Christopher Thorpe (Lancaster University)

DOI # 10.5281/zenodo.4674431

NuTel_Talk.pdf

Video

11:50 AM Heavy Neutrino-Antineutrino Oscillations at Colliders

In this presentation the novel phenomenon of heavy neutrino-antineutrino oscillations is discussed as well as the QFT framework to describe it. Easy to implement formulae are presented which can be used to obtain the expected rate of lepton number conserving/violating displaced vertex events at colliders and the feasibility to observe oscillations for different models.

Speaker: Johannes Rosskopp (University of Basel)

DOI # 10.5281/zenodo.4674610

Heavy Neutrino Anti-Neutrino Oscillations Johannes Rosskopp.mp4

Presentation_HNuOsc_5min.pdf

11:55 AM Discussion Time

12:05 PM .

2:00 PM → 3:30 PM Neutrino Masses and Mixings

Convener: Andrea Longhin (PD)

2:00 PM T2K

Speaker: Mathieu Guigue (LPNHE-IN2P3/CNRS - Sorbonne Université)

DOI # 10.5281/zenodo.5535945

NeuTel2021_final.pdf

T2K

2:30 PM NOvA

Speaker: Matthew Strait

DOI # 10.5281/zenodo.5536133

NOvA

novatalk.pdf

3:00 PM Super-Kamiokande

Speaker: Michael Smy (University of California, Irvine)

DOI # 10.5281/zenodo.5536252

nutel_2021.pdf

Super-Kamiokande

3:30 PM → 3:45 PM Coffee Break

3:45 PM → 5:15 PM Neutrino Telescopes and MultiMessenger Astrophysics

Convener: Francesco D'Eramo (PD)

3:45 PM IceCube and astrophysical sources

Speaker: Nathan Whitehorn (Michigan State University)

IceCube and astrophysical sources

nutelescopes2021_Whitehorn.pdf

4:15 PM Connecting neutrinos, cosmic-rays and photons

Speaker: Anna Franckowiak

Connecting neutrinos, cosmic-rays and photons

4:45 PM Multi energy neutrino sources: galactic and extra-galactic

Speaker: Kohta Murase

Multi energy neutrino sources: galactic and extra-galactic

NuTel2021.pdf

5:15 PM → 5:30 PM Coffee Break

5:30 PM → 6:30 PM Astrophysical Models: (Room 2)

Conveners: Christian Farnese (PD), Marco Grassi (University of Padova - INFN)

5:30 PM Astrophysical Neutrino Decay

Neutrino decay modifies neutrino propagation in a unique way; not only is there flavor changing as there is in neutrino oscillations, there is also energy transport from initial to final neutrinos. The most sensitive direct probe of neutrino decay is currently IceCube which can measure the energy and flavor of neutrinos traveling over extragalactic distances. For the first time we calculate the flavor transition probability for the cases of visible and invisible neutrino decay,including the effects of the expansion of the universe, and consider the implications for IceCube. As an example, we demonstrate how neutrino decay addresses a tension in the IceCube data.

Speaker: Peter Denton (Brookhaven National Laboratory)

Astrophysical Neutrino Decay

Denton_Astro_Nu_Decay.pdf

DOI # 10.5281/zenodo.4748781

5:50 PM The Future of High-Energy Astrophysical Neutrino Flavor Measurements

The next generation of neutrino telescopes, including Baikal-GVD, KM3NeT, P-ONE, TAMBO, and IceCube-Gen2, will be able to determine the flavor of high-energy astrophysical neutrinos with 10% uncertainties. With the aid of future neutrino oscillation experiments --- in particular JUNO, DUNE, and Hyper-Kamiokande --- the regions of flavor composition at Earth that are allowed by neutrino oscillations will shrink by a factor of ten between 2020 and 2040. We critically examine the ability of future experiments and show how these improvements will help us pin down the source of high-energy astrophysical neutrinos and a sub-dominant neutrino production mechanism with and without unitarity assumed. As an illustration of beyond-the-Standard-Model physics, we also show that the future neutrino measurements will constrain the decay rate of heavy neutrinos to be below $2\times 10^{-5}~$$m$/eV/s assuming they decay into invisible particles.

Speaker: Ningqiang Song (Queen's University and Perimeter Institute)

DOI # 10.5281/zenodo.4748795

futurenu_Song-compressed.pdf

The Future of High-Energy Astrophysical Neutrino Flavor Measurements

6:10 PM Hunting for Glashow Resonance with PeV Neutrino Telescopes

The Glashow resonance, which corresponds to the production of a W boson from the resonant interaction between a high-energy electron antineutrino and an electron at rest, offers us a unique signature to disentangle electron antineutrinos from the total high-energy astrophysical neutrino flux. Identification of neutrino flavors in neutrino telescopes is important to the study of production mechanisms and interactions of high-energy neutrinos in astronomical sources and during their propagation. At the same time, a great number of neutrino telescopes are advancing towards a better understanding of the Universe in highest energies. In this talk, I will discuss the prospect of observing Glashow resonant events in current experiments such as IceCube and future experiments which aim to observe Earth-skimming or mountain-penetrating tau neutrinos.

Speaker: Qinrui Liu (University of Wisconsin-Madison)

DOI # 10.5281/zenodo.4748828

Hunting for Glashow Resonance with PeV Neutrino Telescopes

NeuTel_GR_qliu.pdf

5:30 PM → 6:30 PM New Facilities: (Room 1)

Conveners: Chiara Sirignano (PD), Fabio Pupilli (PD)

5:30 PM Capabilities of the DUNE Near Detector Complex

The main goals of the Deep Underground Neutrino Experiment (DUNE) are to measure CP violation in the lepton sector, to make precise measurements of neutrino oscillation parameters, to observe supernova burst neutrinos and to detect rare processes such as proton decay. To fulfill these goals, DUNE will use a highly capable suite of near detectors that work together to constrain flux and cross section uncertainties, which are the dominant sources of uncertainties in oscillation measurements. The near detectors will also be sensitive to numerous signals of physics beyond the standard model. The DUNE near detector complex will consist of a liquid argon TPC, ND-LAr, a magnetized high pressure gas argon TPC surrounded by a calorimeter, ND-GAr, and an on-axis neutrino detection system, SAND whose primary purpose is to monitor the beam with 1% precision. In this talk, I will present an overview of the DUNE near detector suite and its expected capabilities.

Speaker: Dr Tanaz Angelina Mohayai (Fermilab)

2021_02_22_neutel_tmohayai.pdf

Capabilities of the DUNE Near Detector Complex

DOI # 10.5281/zenodo.4955521

5:50 PM Physics potential of THEIA: a hybrid optical neutrino experiment

The combination of recent developments in liquid scintillator, photodetection technology, and reconstruction techniques have made possible the concept of a large-scale neutrino detector that can distinguish Cherenkov and scintillation light. THEIA is a proposed multi-kton experiment that would be pioneering in exploiting the innovative concept of hybrid optical detectors, with the potential to pursue an extremely broad physics program.
If placed at SURF, THEIA will be complementary to DUNE in constraining the oscillation parameters using a different detector technology and target nucleus. The expected sensitivity of THEIA to both $δ_\text{CP}$ and to the neutrino mass ordering is comparable to that of a single DUNE module under the assumption of a similar geometry. At the same time, the low energy threshold and efficient neutron tagging provided by the scintillator target expands the physics reach of THEIA to cover solar and supernova neutrinos. The excellent background discrimination potential makes it even possible to search for neutrinoless $\beta\beta$ decay by loading several tons of a candidate isotope into the detector, in a self-contained inner volume.

Speaker: Daniele Guffanti (Johannes Gutenberg-Universität Mainz)

DOI # 10.5281/zenodo.5045558

gff-THEIA-NuTel21.pdf

Physics potential of THEIA: a hybrid optical neutrino experiment

6:10 PM JUNO Detector Design & Status

The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation liquid scintillator reactor neutrino experiment being built in the Guangdong province in China. JUNO is a multi-purpose experiment with a wide range of applications in neutrino physics, ranging from a mass-ordering determination to solar, geo, and atmospheric neutrino measurements, to detecting supernovae. Moreover JUNO will measure oscillation parameters with a precision of less than one percent. The over 50-meter wide experimental hall, which was recently successfully dug out, stands under more than 700 m of granite overburden. It contains a 35.4-meter diameter acrylic vessel containing 20 ktonne of LAB-based liquid scintillator, making it the largest liquid scintillator container in the world. The spherical detector is submerged in a water pool shielding doubling as a water cherenkov detector which, along with a top tracker above it, serves to precisely reconstruct and veto muon events. Surrounding the vessel are 17612 20'' PMTs and 25600 3'' PMTs, optimised towards JUNO's main goal: a 3-4 sigma significance on the neutrino mass-ordering within the first six years of data-taking, which is expected to start in 2022. This talk presents the detector design and status of JUNO.

Speaker: Hans Theodor Josef Steiger (Technische Universität München)

DOI # 10.5281/zenodo.5045691

JUNO Detector Design & Status

NeuTel2021JunoSteiger.pdf

5:30 PM → 6:30 PM Non Standard Interactions and Cosmology: (Room 3)

Conveners: Francesco D'Eramo (PD), Mauro Mezzetto (PD)

5:30 PM Neutrino thermalization in the early universe: precision calculations

In this talk I will discuss the calculation of neutrino oscillations in the early Universe and of the neutrino thermalization, quantified in particular by the effective number of neutrinos (Neff). Precision calculations of Neff are important in light of the future improvements in the experimental determinations. I will briefly review the state-of-art numerical results and discuss the theoretical expectations for Neff in different scenarios: the standard three-neutrinos case, a case with an additional light sterile neutrino and a non-standard scenario with low-reheating.

Speaker: Stefano Gariazzo (INFN Torino)

210222_neutel.pdf

DOI # 10.5281/zenodo.4674311

video

5:50 PM Breaking isotropy in the early Universe with neutrino oscillations

Neutrino oscillations in the early Universe are commonly assumed to preserve homogeneity and isotropy. However, we know that collective oscillations can break both in the environments of supernovae and neutron star mergers. In this talk I will describe the conditions under which homogeneity and isotropy are broken by neutrino oscillations in the early Universe, and I will demonstrate how this materializes during standard neutrino decoupling with a simple model. Finally, I will comment on the possible observable impact of inhomogeneous and anisotropic neutrino oscillations in the early Universe.

Speaker: Rasmus S. L. Hansen (Niels Bohr Institute)

anisotropic_b.pdf

DOI # 10.5281/zenodo.4674386

NO_ani_animation.mp4

NO_iso_animation.mp4

6:10 PM Euclid and the challenge of neutrino mass detection

The ESA Euclid mission will map the cosmic web with unprecedented precision. Among the main scientific objectives of Euclid one stands out for its interdisciplinary impact: the measurement of the sum of neutrino masses.
In this talk I will highlight the challenges that cosmology will have to face in order to exploit the accuracy of Euclid data, and achieve this groundbreaking result. I will also show the potential consequences of such measurement on the neutrino mass ordering.

Speaker: Maria Archidiacono (University of Milan)

Archidiacono_NuTel.pdf

DOI # 10.5281/zenodo.4674421

video

Tuesday, February 23

10:00 AM → 11:20 AM Double Beta decays and Neutrino Masses: (Room 1)

Conveners: Fabio Pupilli (PD), Filippo Varanini (INFN Padova)

10:00 AM Latest results from the CUORE experiment

The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double-beta (0νββ) decay that has been able to reach the one-ton scale. The detector, located at the Laboratori Nazionali del Gran Sasso in Italy, consists of an array of 988 TeO2 crystals arranged in a compact cylindrical structure of 19 towers. Following the completion of the detector construction in August 2016, CUORE began its first physics data run in 2017 at a base temperature of about 10 mK. Following multiple optimization campaigns in 2018, CUORE is currently in stable operating mode. In 2019, CUORE released its 2nd result of the search for 0νββ corresponding to a TeO2 exposure of 372.5 kg∙yr and a median exclusion sensitivity to a 130Te 0νββ decay half-life of 1.7 × 10^25 yr. We find no evidence for 0νββ decay and set a 90% C.L. Bayesian lower limit of 3.2 × 10^25 yr on the 130Te 0νββ decay half-life. In this talk, we present the current status of CUORE's search for 0νββ, as well as review the detector performance. We finally give an update of the CUORE background model and the measurement of the 130Te two neutrino double-beta (2νββ) decay half-life.

Speaker: Dr Guido Fantini (Università di Roma 1 La Sapienza, Sezione INFN di Roma)

CUORE_NuTel_BM.pdf

DOI # 10.5281/zenodo.5744945

Latest results from the CUORE experiment

10:20 AM KamLAND-Zen 800

KamLAND-Zen 800 is a neutrinoless double-beta decay search experiment with the Kamioka Liquid-scintillator Anti-electron Neutrino Detector (KamLAND). In 2019, we started KamLAND-Zen 800 experiment with 745 kg of xenon. We achieved the background reductions by reducing the radioactive materials in the newly fabricated 25-μm-thick nylon film container for the Xe-loaded LS and developing a new analysis technique to reject the cosmic-ray muon spallation backgrounds. We continue the observation to search within the inverse hierarchy region of the Majorana neutrino effective mass.
In the presentation, the detector status and the estimation of the 0nbb decay search backgrounds will be reported.

Speaker: Hideyoshi Ozaki (RCNS, Tohoku University)

2021-02-23-KamLAND-Zen800-Ozaki.pdf

DOI # 10.5281/zenodo.5744879

KamLAND-Zen 800

10:40 AM Status and prospects of the NEXT experiment

NEXT is a staged experimental program aiming at the detection of neutrinoless double beta (ββ0ν) decay in 136Xe using successive generations of high-pressure gaseous xenon time projection chambers. The collaboration is presently concluding four years of operation of NEXT-White, a radiopure 50-cm diameter and length TPC operated with enriched xenon at 10 bar, at the Laboratorio Subterràneo de Canfranc. NEXT-White has successfully demonstrated the two key features of the technology, namely excellent energy resolution (1% FWHM at the Q-value of the decay) and highly effective topological-based background discrimination. The latter was recently boosted using a new image deblurring technique which allows reducing background by an additional factor of ~5 compared to the previous state-of-the-art. This technique is presently employed for the analysis of two-neutrino double beta decay events recorded in NEXT-White. The next stage of the program is NEXT-100, planned for commissioning in 2021, which will be twice larger than NEXT-White, and operated with 97 kg of enriched xenon at 15 bar, with half-life sensitivity on the scale of 1026 y. In parallel, the collaboration pursues an extensive R&D program to develop the capability of detecting the 136Ba daughter resulting in 136Xe double beta decays inside a running TPC using single molecule fluorescence imaging. This effort can lead to a background-free search for ββ0ν decay on the tonne-scale, with half-life sensitivities close to 1028 y. This talk will present the current status of the program, focusing on recent developments in topological analysis and barium tagging, and outline the future steps of the experiment.

Speaker: Dr Lior Arazi (Ben-Gurion University)

DOI # 10.5281/zenodo.5747288

NEXT NeuTEL 2021 v2.pdf

NEXT NeuTEL 2021 v2.pptx

Status and prospects of the NEXT experiment

11:00 AM The GERDA experiment in the search for neutrinoless double-beta decay

Neutrinoless double beta decay (0νββ) is a hypothetical lepton number violating nuclear process which creates matter without a compensation of anti-matter. If observed, it would give an insight on why our universe is predominantly composed of matter. Furthermore, it would reveal the Majorana nature of neutrinos, namely that they are equal to their anti-matter counterpart, and possibly explain why their mass is so small.
Since 2011, the GERDA collaboration has searched for 0νββ of $^{76}$Ge by operating bare germanium detectors, enriched in the double-beta decaying isotope $^{76}$Ge, in liquid argon. Exploiting the combination of excellent energy resolution of germanium and scintillating properties of argon, the GERDA experiment succeeded to perform a background-free search of 0νββ for the entire duration of its Phase II.
In November 2019, after fulfilling and exceeding the design goals of the experiment, data taking was stopped. No signal has been observed, hence a lower limit on the half-life of 0νββ in $^{76}$Ge has been set at $T_{1/2}>1.8 \times 10^{26}$ years at 90% C.L..
At this talk the final results of the GERDA experiment will be presented.

Speaker: Tommaso Comellato (Technical University of Munich)

Comellato_NeuTel2021.pdf

DOI # 10.5281/zenodo.5744911

The GERDA experiment in the search for neutrinoless double-beta decay

10:00 AM → 11:20 AM Multimessenger Investigations: (Room 2)

Conveners: Elisa Bernardini (Padova), Luca Stanco (PD)

10:00 AM .

10:20 AM Search for neutrinos in coincidence with Gravitational Wave events from LIGO-Virgo O3a Observing Run with the Super-Kamiokande detector

Super-Kamiokande (SK) is a 50-kton water Cherenkov detector, instrumented with ∼13k photomultipliers and running since 1996. It is sensitive to neutrinos with energies ranging from 4.5 MeV to several TeV. A new framework has been developed for the follow-up of gravitational wave (GW) alerts issues by the LIGO-Virgo collaboration (LVC). Neutrinos are searched for, using a 1000-second time window centred on the alert time and in both SK low-energy and high-energy samples.

Such observation can then be used to constrain the neutrino emission from the GW source. The significance of potential signals has been obtained by comparing neutrino direction with the localisation of the GW. The computation of limits on incoming neutrino flux and on the total energy emitted in neutrinos by the source has been performed for the different neutrino flavours.

The results using the LVC GWTC-2 catalogue (covering O3a period) will be presented, as well as the plans for future real-time public release of follow-ups for O4 period (in 2022) and beyond.

Speaker: Mathieu Lamoureux (INFN Padova)

21-02-23_NeuTel_SKGWFollowUp.pdf

DOI # 10.5281/zenodo.5786038

Search for neutrinos in coincidence with Gravitational Wave events from LIGO-Virgo O3a Observing Run with the Super-Kamiokande detector

10:40 AM Ultra-high-energy multi-messenger activities at the Pierre Auger Observatory

The last decade of experimental data has provided many insights on the
most extreme phenomena in the Universe where gravity and particle
physics come together. A multi-messenger approach, combining data from
complementary experiments and exploiting the intimate connection
between ultra-high-energy cosmic rays, photons and neutrinos, is
needed to shed light on the still open crucial aspects regarding their
sources and propagation to the Earth. The Pierre Auger Observatory,
the largest ultra-high-energy cosmic ray observatory ever built, has a
high potential for multi-messenger studies given its sensitivity to
photons and neutrinos in the EeV energy range and above. We report
results and perspectives for both diffuse and targeted searches.

Speaker: Dr Viviana Scherini (INFN Lecce)

DOI # 10.5281/zenodo.5786521

Ultra-high-energy multi-messenger activities at the Pierre Auger Observatory

vscherini_MMAuger.pdf

11:00 AM Ultra-high-energy neutrino searches and gravitational wave follow-up with the Pierre Auger Observatory

The Surface Detector (SD) of the Pierre Auger Observatory is used to search for ultra-high-energy (UHE) neutrinos with energies beyond 0.1 EeV of all flavours. They induce extensive air showers (EASs) that are efficiently detected and well distinguishable from those produced by UHE cosmic rays. This, along with the large aperture of the SD, leads to a UHE neutrino sensitivity competitive to that of dedicated neutrino telescopes. No UHE neutrinos have been found to date, imposing strong limits on their flux and thereby severely constraining a variety of production models. Stringent limits on the UHE neutrino flux from point sources in a large declination band (−80° to 60°) are obtained. The varying exposure for different EAS inclinations, moving across the sky, temporarily causes a strongly enhanced neutrino sensitivity in certain directions, benefiting multi-messenger follow-up searches of transient events. As an application, the efforts of gravitational wave event follow-up searches for UHE neutrinos will be discussed.

Speaker: Michael Schimp (Bergische Universität Wuppertal)

DOI # 10.5281/zenodo.5786477

NuTel2021_Talk.pdf

Ultra-high-energy neutrino searches and gravitational wave follow-up with the Pierre Auger Observatory

10:00 AM → 11:20 AM Non Standard Interactions: (Room 3)

Conveners: Andrea Longhin (PD), Mauro Mezzetto (PD)

10:00 AM Neutrino mixing by modifying the Yukawa coupling structure of Constrained sequential Dominance

In the constrained sequential dominance (CSD), tri-bimaximal mixing (TBM) pattern of the neutrino sector has been explained, by proposing a certain Yukawa coupling structure for the right-handed neutrinos of the model. However, from the current experimental data it is known that the values of the neutrino mixing angles are deviated from the TBM values. In order to explain this neutrino mixing, we first propose a phenomenological model where we consider Yukawa couplings which are modified from that of CSD. Essentially, we add small complex parameters to the Yukawa couplings of CSD. Using these modified Yukawa couplings, we demonstrate that neutrino mixing angles can deviate from their TBM values. We also construct a model, based on a flavor symmetry, in order to justify the modified form of Yukawa couplings of our work.

Speaker: Mr Joy Ganguly (Indian Institute of Technology Hyderabad)

DOI # 10.5281/zenodo.4680576

Joy_conference.pdf

Neutrino mixing by modifying the Yukawa coupling structure of Constrained sequential Dominance

10:20 AM Leptogenesis from low energy CP violation in minimal left-right symmetric model

We perform a thermal unflavored leptogenesis analysis on minimal left-right symmetric models in which the left-right symmetry is identified as generalized parity or charged conjugation. When left-right symmetry is unbroken in lepton Yukawa sector, the neutrino Dirac coupling matrix is completely determined by neutrino masses and mixing angles, which allows CP violation needed to generate leptogenesis totally reside in the low energy sector.
Both type I and mixed type I + II neutrino mass generation mechanisms, together with two lepton asymmetry generation ones, are considered. After solving the Boltzmann equations numerically, we find that the low energy CP phases in the lepton mixing matrix can successfully produce the observed baryon asymmetry, and in some cases the Dirac CP phase can be the only source of CP violation. Finally we discuss the interplay among low energy CP phase measurements, leptogenesis and neutrinoless double beta decay, and show that the viable models for successful leptogenesis can be probed in next generation neutrinoless double-beta decay experiments.

Speaker: Dr Xinyi Zhang (Institute of High Energy Physics, Chinese Academy of Sciences)

DOI # 10.5281/zenodo.4687098

Leptogenesis from low energy CP violation in minimal left-right symmetric model

NeuTel2021_lep_XYZ_final.pdf

10:40 AM Explaining the ANITA events by a $L_e-L_\tau$ gauge model

The ANITA experiment has registered two anomalous events that can be interpreted as $\nu_\tau$ or $\bar{\nu}_\tau$ with a very high energy of O(0.6)~EeV emerging from deep inside the Earth. At such high energies, the Earth is opaque to neutrinos so the emergence of these neutrinos at such large zenith angles is a mystery. I will present a model that explains the two anomalous events through a $L_e-L_\tau$ gauge interaction involving two new Weyl fermions charged under the new gauge symmetry. We find that, as a bonus of the model, the lighter Weyl fermion can be a dark matter component. We discuss how the ANITA observation can be reconciled with the IceCube and Auger upper bounds. We also demonstrate how this model can be tested in future by collider experiments.

Speaker: Yasaman Farzan

DOI # 10.5281/zenodo.4687865

Explaining the ANITA events by a 𝐿𝑒−𝐿𝜏 gauge model

Yasaman-Venice2021.pdf

11:00 AM Importance of second oscillation maxima in probing invisible neutrino decay

The constraints on invisible neutrino decay can come from future planned/proposed long baseline experiments - T2HK/T2HKK and ESS$\nu$SB. The T2HKK and ESS$\nu$SB experiments are both designed to have energy peak near the second-oscillation maximum of $P_{\mu e}$ while T2HK has the energy peak at the first oscillation maximum of $P_{\mu e}$. We perform a full three flavour study using matter effect and obtain the sensitivity to $\tau_3 / m_3$ for these experiments. In particular, we investigate how the experiments at first and second oscillation maximum fare in presence of neutrino decay. We also study the important factors on which the measurement of $\theta_{23}$ can depend in presence of decay. We have found that in presence of decay, the overall octant sensitivity is enhanced. This can be attributed to the octant sensitive contribution coming from the disappearance channel ($P_{\mu \mu}$) in presence of decay.

Speaker: Kaustav Chakraborty (Physical Research Laboratory, Ahmedabad)

decay-2nd-osc-max-neutel2021.pdf

DOI # 10.5281/zenodo.4680551

Importance of second oscillation maxima in probing invisible neutrino decay

11:20 AM → 11:35 AM Coffee Break

11:35 AM → 12:40 PM Double Beta decays and Neutrino Masses: (Room 1)

Conveners: Fabio Pupilli (PD), Filippo Varanini (INFN Padova)

11:35 AM Search for light exotic fermions in double beta decay

Double beta decay is predicted in the Standard Model with the emission of two active neutrinos. Models in which light exotic fermions are emitted, replacing one or both the neutrinos in the final state, could be tested through the search for spectral distortions in the electron spectrum with respect to the Standard Model expectations. In this contribution the discovery potential of a selection of neutrinoless double beta decay experiments will be presented, under two concrete scenarios: the single production of a light sterile neutrino in double beta decay and the pair production of light Z$_2$-odd fermions. It will be shown that future searches allow to test for the first time a new part of the parameter space at the MeV-mass scale, as discussed in [1].
[1] M. Agostini, E. Bossio, A. Ibarra, X. Marcano, arXiv:2012.09281 (2020)

Speaker: Ms Elisabetta Bossio (Physik-Department, Technische Universität München)

DOI # 10.5281/zenodo.5744968

FlashTalk_NeuTel_Bossio.pdf

Search for light exotic fermions in double beta decay

11:40 AM The FBI concept in the context of Ba-tagging for neutrinoless double beta decay events

It has been recently shown that the identification of the single positively-charged ion Ba2+ produced in double beta decay events in Xe-136 may be possible in a high-pressure gas TPC using molecular indicators. The NEXT collaboration is pursuing an intense R&D program geared towards a future detector able to detect “tag” the Ba2+ produced in such events, a technique that could lead to an essentially background-free neutrinoless double beta decay experiment. In this talk, I will describe the R&D program of the NEXT collaboration. Particular emphasis will be given to the BOLD program, based on a new type of fluorescent bicolor indicators (FBI) capable of separating chelated indicators following Ba2+ capture from unchelated ones, with a very large signal to noise ratio.

Speaker: Prof. Zoraida Freixa (University of the Basque Country (UPV/EHU))

DOI # 10.5281/zenodo.5745020

NeuTel_ZF_FINAL.pdf

The FBI concept in the context of Ba-tagging for neutrinoless double beta decay events

11:45 AM Double beta decay results from the CUPID-0 experiment

The development of cryogenic calorimeters to search for neutrinoless double-beta decay (0$\nu$DBD) has given in the last years increasingly promising results. The possibility of achieving ton-scale exposures, maintaining an excellent energy-resolution, makes this kind of detector very suitable for a next-generation experiment.
In order to achieve a nearly background-free condition, scintillating crystals for 0$\nu$DBD have been developed. Thanks to the light-assisted particle discrimination, cryogenic calorimeters based on scintillating crystals demonstrated the complete rejection of the dominant alpha background.
The CUPID-0 detector, an array of 24 ZnSe enriched crystals, is one of the most advanced examples of such experimental technique.
CUPID-0 has taken data at LNGS from 2017 to 2019, measuring the lowest counting rate in the region of interest for this technique. It has also set the most stringent limit on the Se-82 0$\nu$DBD, reaching competitive results with limited exposure of approximately 10 kg $\cdot$ y. In this contribution, we present the final results of CUPID-0 Phase I including a detailed model of the background, the measurement of the Se-82 2$\nu$DBD half-life, and the search for CPT violation.
Furthermore, we present the first results after the detector upgrade in 2019 which purpose is a better understanding of the background sources.

Speaker: Emanuela Celi (Istituto Nazionale di Fisica Nucleare)

DOI # 10.5281/zenodo.5747269

Double beta decay results from the CUPID-0 experiment

NeuTel2021_Celi.pdf

11:50 AM The search for 0νECβ+ of 120Te with CUORE

The search for $0 \nu EC \beta^+$ of $^{120}$Te with CUORE
Alice Campani (on behalf of the CUORE collaboration)
Università degli studi di Genova – INFN
CUORE (Cryogenic Underground Observatory for Rare Events) is a ton-scale experiment located at the LNGS searching for neutrinoless double beta decay of $^{130}$Te. The detector consists of TeO$_2$ crystals operated as cryogenic calorimeters. The use of tellurium with natural isotopic composition allows us to search for the decay of other isotopes. The neutrinoless positron emitting electron capture of $^{120}$Te (natural abundance 0.09(1)%) has a clear signature from the 511-keV annihilation γ rays. We present an analysis of this process based on a new algorithm to perform the simultaneous spectral fit over five selected decay scenarios. Each scenario is characterized by a set of crystals simultaneously interested by a detectable energy release. We describe the blinded analysis we performed to model multi-site background structures and study the systematics.

Speaker: Alice Campani (GE)

DOI # 10.5281/zenodo.5747301

NuTel_ACampani.pdf

The search for 0νECβ+ of 120Te with CUORE

11:55 AM Discussion Time

12:05 PM Scintillating Li2MoO4 Bolometers for neutrinoless double beta decay search

The next generation experiment CUPID will search for neutrinoless double beta decay using scintillating Li$_2$MoO$_4$ bolometers to study the candidate isotope $^{100}$Mo. The scintillating properties of these crystals allow for the dual read-out of heat and light signals to suppress the background induced by alpha particles. This feature, together with the high Q-value of $^{100}$Mo, will reduce the background level by a factor 100 with respect to CUORE, the predecessor of CUPID. The R&D results presented concern the study of the detector performances in terms of energy resolution, a key element to search for rare decays, and light yield, to understand the particle identification capabilities of the experiment.

Speaker: Alberto Ressa

DOI # 10.5281/zenodo.5750091

Scintillating Li2MoO4 Bolometers for neutrinoless double beta decay search

Scintillating Li2MoO4 Bolometers for neutrinoless double beta decay search.pdf

12:10 PM $\gamma$ background reduction in $0\nu\beta\beta$ searches with organic compound holder

I present dedicated studies and measurements aiming to the reduction of the $\gamma$ background in the $0\nu\beta\beta$ ROI for TeO$_{2}$ calorimeters. This is mainly due to 2615 keV $\gamma$'s scattering Compton with materials next to the detectors. It can be lowered by replacing the usual copper holders with organic compounds structures. TeO$_{2}$ crystals, positioned in a PMMA holder, have been characterized. In particular, they have an energy resolution of $\sim$ 5 keV at 2615 keV, the same of a copper holder, built as reference. The PMMA assembly ROI background is lower than the one in copper. A more realistic application has been considered by simulating the inner CUORE detector supporting structure made of PMMA. I obtain a considerable $\gamma$ background reduction factor of $4.7^{+0.5}_{-0.6}$ for photons coming from environmental sources and of $5.0^{+0.1}_{-0.2}$ for near detector contaminations.

Speaker: Mr Stefano Ghislandi (Gran Sasso Science Institute)

DOI # 10.5281/zenodo.5744979

GhislandiStefanoPresentation.pdf

𝛾 background reduction in 0𝜈𝛽𝛽 searches with organic compound holder

12:15 PM Developing the next neutrino mass experiment: Project 8 Phase III

Project 8 is a next-generation direct neutrino mass experiment using tritium beta decay. To reach the target sensitivity of 40meV, major technological development is necessary. Building up on the milestones achieved so far, I will present the next developmental phases of Project 8: In Phase III, atomic tritium will be trapped magnetically, and cyclotron radiation emission spectroscopy (CRES) will be demonstrated in free space. The knowledge gained from Phase III will inform the design and operation of a large-volume atomic tritium experiment, sensitive to the entire mass range allowed by the inverse neutrino mass hierarchy.

Speaker: Juliana Stachurska (MIT)

Developing the next neutrino mass experiment: Project 8 Phase III

DOI # 10.5281/zenodo.5747348

Project8_Ph3_NeuTel.pdf

12:20 PM A novel technique for the study of pile-up events in cryogenic bolometers

In this talk, I will briefly describe the technique we developed to study the pile-up rejection capability of cryogenic bolometers. The precise characterization of the detector time resolution is indeed of crucial importance for next-generation cryogenic-bolometer experiments searching for neutrinoless double-beta decay, such as CUPID, in order to discriminate against the pile-up of two-neutrino double decay events, which will represent a non-negligible contribution to the background. Our approach consists in producing artificial pile-up events with a programmable waveform generator, thus allowing for a complete control of the time separation and relative energy of the individual components of the generated pile-up events. I will present the results we obtained by applying this technique to a small array of detectors at the Laboratori Nazionali del Gran Sasso, in Italy.

Speaker: Stefano Dell'Oro (UniMib)

2021-02-23_SDelloro_pileup_v2.pdf

A novel technique for the study of pile-up events in cryogenic bolometers

DOI # 10.5281/zenodo.5744808

12:25 PM Latest results of the R2D2 project: a possible future neutrino double beta decay experiment

The search for neutrinoless double beta decay could cast light on one critical piece missing in our knowledge i.e. the nature of the neutrino mass. Its observation is indeed the most sensitive experimental way to prove that neutrino is a Majorana particle. The observation of such a potentially rare process demands a detector with an excellent energy resolution, an extremely low radioactivity and a large mass of emitter isotope. Nowadays many techniques are pursued but none of them meets all the requirements at the same time. The goal of R2D2 is to prove that a spherical high pressure TPC could meet all the requirements and provide an ideal detector for the 0νββ decay search. The prototype has demonstrated an excellent resolution with Argon and the preliminary results with Xenon are already very promising. In the proposed talk the R2D2 results obtained with the first prototype will be discussed as well as the project roadmap and future developments.

Speaker: Dr Tom Neep

DOI # 10.5281/zenodo.5750070

Latest results of the R2D2 project: a possible future neutrino double beta decay experiment

r2d2-results-neep.pdf

12:30 PM Discussion Time

11:35 AM → 12:35 PM Multimessenger Investigations: (Room 2)

Conveners: Elisa Bernardini (Padova), Mathieu Lamoureux (INFN Padova)

11:35 AM Search for neutrino non-standard interactions with 10 years of ANTARES data and perspectives for KM3NeT/ORCA

The ANTARES neutrino telescope and its next-generation successor, KM3NeT, located in the abyss of the Mediterranean Sea, have been designed to study neutrinos from a variety of sources over a wide range of energies and baselines. One of the primary goals of the experiments is to determine the Earth matter effects stemming from the energy and zenith angle dependence of the atmospheric neutrinos in the multi-GeV range.

In this talk, I will present the physics potential of ANTARES and KM3NeT/ORCA (ORCA being the low energy sub-array of KM3NeT) detectors to measure sub-dominant effects in the atmospheric neutrino oscillations, namely, neutrino non-standard interactions (NSIs). A likelihood-based search for NSIs with 10 years of atmospheric muon-neutrino data recorded with ANTARES will be reported and sensitivity projections for ORCA, based on realistic detector simulations, will be shown. Remarkably, the limits obtained with ANTARES in the NSI $\mu - \tau$ sector represent the most stringent bounds up to date.

Speaker: Mr Nafis Rezwan Khan Chowdhury (IFIC, Valencia)

DOI # 10.5281/zenodo.5785957

FlashTalk#141_NeuTel2021_ANTARESKM3NeT_Chowdhury.pdf

Search for neutrino non-standard interactions with 10 years of ANTARES data and perspectives for KM3NeT/ORCA

11:40 AM Constraining the contribution of Gamma-Ray Bursts to the diffuse neutrino flux with the ANTARES dataset (2007-2017)

Addressing the origin of the observed astrophysical neutrino flux is of paramount importance nowadays, since the sources generating such neutrinos still remain a mystery. Among the likely astrophysical sources of detectable high-energy neutrinos (e.g. blazars, supernova remnants etc.), also Gamma-Ray Bursts (GRBs) play a fundamental role, since they are among the few astrophysical sources capable of achieving the required energy to contribute to the detected
astrophysical neutrino flux. Within this context, we present the results of a stacked search for muon astrophysical neutrinos performed in coincidence with 784 GRBs in the period 2007-2017 using ANTARES data. The major improvement with respect to previous analyses is now the estimation of systematic uncertainties due to poor knowledge on some of the model parameters were computed on the diffuse flux, propagating the uncertainties on the barely characterized GRB parameters of each individual burst to the stacked limit. Given the absence of coincident neutrinos with the analyzed GRBs, this analysis has allowed to constrain the contribution of the detected GRB population to the neutrino diffuse flux to be less than 10% around 100 TeV.

Speaker: Angela Zegarelli (Istituto Nazionale di Fisica Nucleare)

Constraining the contribution of Gamma-Ray Bursts to the diffuse neutrino flux with the ANTARES dataset (2007-2017)

DOI # 10.5281/zenodo.5786555

Zegarelli_flashTalk_GRBstackingsearch_ANTARES.pdf

11:45 AM Untriggered multiple flare neutrino search from a source catalog with 10 years of IceCube data

In a recent time-integrated investigation of a catalog of 110 gamma-ray emitters, IceCube observed a cumulative neutrino excess in the flux produced during 10 years. Such an excess, incompatible with the background at the level of $3.3\sigma$, was mainly due to the starburst galaxy NCG 1068 and the BL Lacs TXS 0506+056, PKS 1424+240 and GB6 J1542+6129. Here we present the results of a time-dependent analysis of the same catalog. Unlike for past searches, this analysis does not only look for the most significant cluster of events but it can potentially detect multiple flares from a single direction. This analysis confirms a significant neutrino excess in the northern sky and identifies M87, hosting a very close-by black hole, as the most significant time-dependent source of the catalog. Moreover, it confirms the detection of a long flare in 2014/2015 and finds a shorter second flare, related to the time of the high-energy neutrino event in 2017, from the direction of TXS 0506+056.

Speaker: Francesco Lucarelli (University of Geneva)

DOI # 10.5281/zenodo.5786405

Nu_telescopes_Untriggered_multiple_flare_neutrino_search_from_a_source_catalog.pdf

Untriggered multiple flare neutrino search from a source catalog with 10 years of IceCube data

11:50 AM Neutrino fluence from X-ray flares of blazars frequently observed by Swift

Blazars are the most extreme subclass of active galactic nuclei with relativistic jets emerging from a super-massive black hole and forming a small angle with respect to our line of sight. Blazars are also known to be flaring sources: they exhibit large flux variations over a wide range in frequency and on multiple timescales, ranging from a few minutes to several months. Blazar flares have been suggested as ideal candidates for enhanced neutrino production. Interestingly, the flaring blazar TXS 0506+056 was the first astrophysical source to be associated with a high-energy neutrino. While neutrino production during gamma-ray flares has been widely discussed, the neutrino yield of X-ray flares has received less attention. Here, we compute the predicted neutrino fluence of X-ray flares detected in blazars observed with Swift-XRT more than 50 times. To this end, we applied the Bayesian Block algorithm to the 1 keV XRT light curves of frequently observed blazars to characterize statistically significant variations, at the same time suppressing the inevitable contaminating observational errors. We categorized flares into classes based on their variation from the time-average value of the data points. Using spectral information, we computed for each flare the 1-10 keV fluence. The latter is shown to be a good proxy for the all-flavor neutrino flux in the scenario where X-ray flares are powered by synchrotron radiation of protons intermittently accelerated in the blazar jet. We present preliminary results of our analysis for a few indicative blazars.

Speaker: Stamatios-Ilias Stathopoulos

DOI # 10.5281/zenodo.5786492

Neutrino fluence from X-ray flares of blazars frequently observed by Swift

Stathopoulos (Presentation).pdf

11:55 AM Discussion Time

https://mediaspace.unipd.it/media/XIX+International+Workshop+on+Neutrino+Telescopes+- +Parallel+Room+2/1_5ximyxtb?st=7150&ed=7268

12:05 PM Searching for Dark Matter from the Sun with Ten Years of IceCube Data

Dark matter's existence (DM) has been well-established by repeated experiments over many length scales. Even though DM is expected to make up 85% of the current matter content of the Universe, its nature remains unknown. One broad class of corpuscular DM motivated by Standard Model (SM) extensions is weakly interacting massive particles (WIMPs). WIMPs generically have a non-zero cross-section with SM nuclei, so they can scatter off nuclei in large celestial bodies such as the Sun, thereby losing energy and becoming gravitationally bound. After repeated scatterings, WIMPs sink to the solar center, leading to an excess of WIMPs there. Furthermore, WIMPs can annihilate to unstable SM particles, eventually yielding stable SM particles. Only neutrinos can escape the dense solar core. Thus, neutrino observatories may look for these neutrinos as evidence of WIMPs. In this talk, I will present the current status of IceCube's solar WIMP search, which covers the mass range from 10 GeV to 1 TeV.

Speaker: Jeff Lazar (University of Wisconsin - Madison)

DOI # 10.5281/zenodo.5786017

jlazar_neutel_20210226.pdf

Searching for Dark Matter from the Sun with Ten Years of IceCube Data

12:10 PM Atmospheric electron and muon neutrinos energy spectrum with the ANTARES neutrino telescope

In this controbution a combined measurement of the energy spectra of atmospheric electron and muon neutrinos in the energy range between 100 GeV and 50 TeV with the ANTARES neutrino telescope is presented. The analysis uses 3012 days of detector livetime in the period 2007–2017, and selects 1016 neutrinos interacting in (or close to) the instrumented volume of the detector, yielding shower-like events and starting track events. The contamination of the atmospheric muon background in the final sample is suppressed at the level of a few per mill by different steps in the event selection, including a Boosted Decision Tree classifier. The distribution of reconstructed events is unfolded in terms of electron and muon neutrino fluxes. The derived energy spectra are compared with previous measurements.

Speaker: Federico Versari (INFN -CNAF)

Atmospheric electron and muon neutrinos energy spectrum with the ANTARES neutrino telescope

DOI # 10.5281/zenodo.5786468

NuTel_2021_FedericoVersari.pdf

12:15 PM Rapid Response to Extraordinary Events: the Gamma-Ray Follow Up (GFU) platform for IceCube

The discovery of an astrophysical flux of high-energy neutrinos with IceCube is a milestone in the field of multi-messenger astronomy. Traditional time-integrated searches for point-like neutrino sources have so far been unsuccessful because of large backgrounds and weak neutrino signals. IceCube’s capability of observing the sky with full duty cycle enables us to search for transient neutrino emissions and alert the astrophysical community with low latency in case of detection, aiming for the identification of an electromagnetic counterpart of rapidly fading sources. In this talk, the Gamma-Ray Follow Up (GFU) platform will be presented, which allows generating and sending alerts to the astrophysical community in response to the real-time identification of muon neutrino candidates. These alerts are triggered by neutrino clusters coming from, both, catalogued gamma-ray emitters and anywhere in the sky, as well as by single high-energy neutrino events.

Speaker: Caterina Boscolo Meneguolo

DOI # 10.5281/zenodo.5785974

GFU_Boscolo_NeuTel2021.pdf

GFU_NeuTel_Boscolo.mp4

Rapid Response to Extraordinary Events: the Gamma-Ray Follow Up (GFU) platform for IceCube

12:20 PM MAGIC observation strategy of IceCube neutrino alerts

Astrophysical neutrinos at hundreds of TeV are expected to originate in
hadronic interactions, but their sources are still unknown. The chance of
identifying the emitting objects can be improved by a rapid electromagnetic
follow-up of neutrino events. Here, the MAGIC telescopes play a relevant role in
identifying very high energy (>100 GeV) γ-ray counterparts. This is achieved by
responding to different types of neutrino alerts issued by the IceCube alert
system. Thanks to this program, a very high energy neutrino detected by
IceCube was found to be spatially coincident with the blazar TXS 0506+056
and in time coincidence with a flare of this source. This is so far the only
observation with a chance coincidence probability rejected at the 3σ level,
suggesting blazars as candidate neutrino emitters.
In this talk a description of MAGIC observation strategy in response to IceCube
alerts will be given, together with a discussion on past follow-up, in particular
on the case of TXS 0506+056.

Speaker: Ilaria Viale (Università degli Studi di Padova)

DOI # 10.5281/zenodo.5786508

MAGIC observation strategy of IceCube neutrino alerts

VialeIlaria_NeuTel2021_slides.pdf

12:25 PM Discussion Time

https://mediaspace.unipd.it/media/XIX+International+Workshop+on+Neutrino+Telescopes+- +Parallel+Room+2/1_5ximyxtb?st=8677&ed=8900

11:35 AM → 12:35 PM Non Standard Interactions: (Room 3)

Conveners: Andrea Longhin (PD), Mauro Mezzetto (PD)

11:35 AM Improvements on perturbative oscillation formulas including non-standard neutrino interactions

We use perturbation theory to obtain neutrino oscillation probabilities, including the standard mass-mixing paradigm and non-standard neutrino interactions (NSI). The perturbation is made on the standard parameters ${\Delta}{m}_{21}^{2}/{\Delta}{m}_{31}^{2}$ and sin2(θ13) and on the non-diagonal NSI parameters, but keeps diagonal NSI parameters non-perturbated. We perform the calculation for the channels νμ → νe and νμ → νμ. The resulting oscillation formulas are compact and present functional structure similar to the standard oscillation (SO) case. They apply to a wide range in the allowed NSI space of parameters and include the previous results from perturbative approaches as limit cases. Also, we use the compact formulas we found to explain the origin of the degeneracies in the neutrino probabilities in terms of the invariance of amplitude and phase of oscillations. Then we determine analytically the multiple sets of combinations of SO and NSI parameters that result in oscillation probabilities identical to the SO case.

Speaker: Prof. Diego Gratieri (Universidade Federal Fluminense)

DOI # 10.5281/zenodo.4687125

Improvements on perturbative oscillation formulas including non-standard neutrino interactions

Nu_Telescopes_2021_DRG.pdf

11:40 AM Analytical solutions to renormalization-group equations of neutrino oscillation parameters in matter

The evolution of effective neutrino masses and mixing parameters in the ordinary matter can be characterized by a complete set of differential equations with respect to the matter parameter $a \equiv 2\sqrt{2}G^{}_{\rm F}N^{}_eE$, in analogy with the renormalization-group equations (RGEs) for running parameters. With some reasonable approximations, we find analytical solutions to the above differential equations, and obtain simple and compact formulas of all the effective oscillation parameters. Interestingly, the ratio of effective Jarlskog invariant $\widetilde{\cal J}$ in matter to its counterpart ${\cal J}$ in vacuum can be well described by $\widetilde{\cal J}/{\cal J} \approx 1/(\widehat{C}^{}_{12} \widehat{C}^{}_{13})$, where $\widehat{C}^{}_{12} \equiv \sqrt{1 - 2 \widehat{A}^{}_* \cos 2\theta^{}_{12} + \widehat{A}^2_*}$ with $\widehat{A}^{}_* \equiv a\cos^2 \theta^{}_{13}/\Delta^{}_{21}$ and $\widehat{C}^{}_{13} \equiv \sqrt{1 - 2 A^{}_{\rm c} \cos 2\theta^{}_{13} + A^2_{\rm c}}$ with $A^{}_{\rm c} \equiv a/\Delta^{}_{\rm c}$.

Speaker: Dr Xin Wang (Institute of High Energy Physics, CAS)

2021neutel_Wang.pdf

Analytical solutions to renormalization-group equations of neutrino oscillation parameters in matter

DOI # 10.5281/zenodo.4680497

11:45 AM Impact of non-unitary neutrino mixing on physics potential of long baseline experiments

In this work, we investigate the effects of non-unitary neutrino mixing on the determination of current unknown parameters in neutrino oscillation physics. From our analysis, we found that non-unitarity parameters in the 21 sector are sensitive to the NOνA experiment. However, it is observed that the NOνA experiment is not expected to improve the current knowledge of those parameters. We also found that the sensitivities to current unknowns have deteriorated significantly in the presence of non-unitary lepton mixing and these sensitivities crucially depend upon the new CP-violating phase in the non-unitary mixing. Further, we find that the degeneracy resolution capability of the NOνA experiment is reduced in the presence of non-unitarity parameters. However, the synergy between the currently running experiments T2K and NOνA can improve the parameter degeneracy resolution, and hence there is an enhancement in the sensitivities of unknowns.

Speaker: SOUMYA C (Institute of Physics Bhubaneswar)

DOI # 10.5281/zenodo.4687600

Impact of non-unitary neutrino mixing on physics potential of long baseline experiments

NuTel2021_Soumya_C_Flashtalk_178.pdf

11:50 AM Quantum Studies of Neutrinos

Two and three flavor oscillating neutrinos are shown to exhibit the properties bipartite and tripartite quantum entanglement [1]. Neutrino eigenstates are mapped to qubits used in quantum information theory. Such quantum bits of the neutrino state can be encoded on a IBMQ computer using quantum computing as a tool. We show the implementation of entanglement in the two neutrino system (in vacuum) on the IBM quantum processor [2]. Quantum simulation of entangled oscillating neutrinos in matter with non-standard interactions (NSIs) quantum circuits on IBM quantum computer is in progress.

References:
[1]. A.K.Jha, S.Mukherjee and B.A.Bambah, Tri-Partite entanglement in Neutrino Oscillations, [arXiv:2004.14853 [hep-ph]]. (This paper was accepted on 5th January, 2021 for the publications in the journal Modern Physics Letter A).
[2] A.K.Jha, A.Chatla and B.A.Bambah, Quantum simulation of oscillating neutrinos, [arXiv:2010.06458 [hep-ph]].

Speaker: Mr Abhishek Jha (UNIVERSITY OF HYDERABAD)

Abhishek_ID204.pdf

DOI # 10.5281/zenodo.4680524

Quantum Studies of Neutrinos

11:55 AM Discussion Time

12:05 PM Evolution of Neutrino Mass-Mixing Parameters in Matter with Non-Standard Interactions

We explore the role of matter effect in the evolution of neutrino oscillation parameters in the presence of non-standard interactions (NSIs). We derive approximate analytical expressions showing evolution of mass-mixing parameters in matter and in presence of NSIs. We observe that only the NSIs in (2,3) block ($\varepsilon_{\mu\mu}$, $\varepsilon_{\tau\tau}$, and $\varepsilon_{\mu\tau}$) affect the running of $\theta_{23}$. $\varepsilon_{e\mu}$ and $\varepsilon_{e\tau}$ have stronger impact on the $\theta_{13}$ evolution. We show the utility of our approach in addressing some important features related to neutrino oscillation: a) unraveling interesting degeneracies between $\theta_{23}$ and NSI parameters, b) estimating the resonance energy in presence of NSIs when $\theta_{13}$ in matter becomes maximal, c) estimating the required baseline length and neutrino energies to have maximal matter effect in $\nu_{\mu}$ $\rightarrow$ $\nu_{e}$ transition in presence of NSI parameters, and d) studying the impact of NSIs in (2,3) block on the $\nu_{\mu}$ $\to$ $\nu_{\mu}$ survival probability.

Speaker: Sudipta Das (Institute of Physics, Bhubaneswar)

DOI # 10.5281/zenodo.4680591

Evolution of Neutrino Mass-Mixing Parameters in Matter with Non-Standard Interactions

NeuTEL_flash_talk.pdf

12:10 PM A New Approach to Probe Non-Standard Interactions in Atmospheric Neutrino Experiments

We propose a new approach to explore the neutral-current non-standard neutrino interactions (NSI) in atmospheric neutrino experiments using oscillation dips and valleys in reconstructed muon observables, at a detector like ICAL that can identify the muon charge. We focus on the flavor-changing NSI parameter $\varepsilon_{\mu\tau}$, which has the maximum impact on the muon survival probability in these experiments. We show that non-zero $\varepsilon_{\mu\tau}$ shifts the oscillation dip locations in $L/E$ distributions of the up/down event ratios of reconstructed $\mu^-$ and $\mu^+$ in opposite directions. We introduce a new variable $\Delta d$ representing the difference of dip locations in $\mu^-$ and $\mu^+$, which is sensitive to the magnitude as well as the sign of $\varepsilon_{\mu\tau}$, and is independent of the value of $\Delta m^2_{32}$. We further note that the oscillation valley in the ($E$, $\cos \theta$) plane of the reconstructed muon observables bends in the presence of NSI, its curvature having opposite signs for $\mu^-$ and $\mu^+$. We demonstrate the identification of NSI with this curvature, which is feasible for detectors like ICAL having excellent muon energy and direction resolutions. We illustrate how the measurement of contrast in the curvatures of valleys in $\mu^-$ and $\mu^+$ can be used to estimate $\varepsilon_{\mu\tau}$. Using these proposed oscillation dip and valley measurements, the achievable precision on $|\varepsilon_{\mu\tau}|$ at 90% C.L. is about 2% with 500 kt$\cdot$yr exposure. The effects of statistical fluctuations, systematic errors, and uncertainties in oscillation parameters have been incorporated using multiple sets of simulated data. Our method would provide a direct and robust measurement of $\varepsilon_{\mu\tau}$ in the multi-GeV energy range.

Speaker: Mr Anil Kumar (Institute of Physics, Bhubaneswar)

A New Approach to Probe Non-Standard Interactions in Atmospheric Neutrino Experiments

DOI # 10.5281/zenodo.4687417

NuTel_Anil_Kumar_NSI.pdf

12:15 PM A Dark Seesaw at Low Energy Experiments

We introduce a renormalizable and anomaly-free $U(1)^\prime$ gauge extension of the standard model, and show that it can provide a consistent explanation of a number of prominent low energy anomalies. We show that the simultaneous presence of all portal connections between a neutral dark sector and the SM lead to unique phenomenological signatures at experiment. We further discuss these signatures and the ongoing effort to search for these classes of models, in particular, as a solution to the MiniBooNE low energy excess.

Speaker: Asli Abdullahi (Durham)

A Dark Seesaw at Low Energy Experiments

DOI # 10.5281/zenodo.4687241

NueTel_2021_AA.pdf

12:20 PM Search for Non Standard Neutrino Interactions and other Lorentz Invariance Violation effects in neutrino physics

The neutrino experiments that in the near future are expected to shed some light on a series of open fundamental questions (like the final proof of the leptonic CP violation and the determination of its value, the \theta_23 octant determination, the solution of the mass ordering problem) will also reinforce our knowledge of the general neutrino properties and they could be used to search for possible deviations from the expected oscillation and mass pattern. These signals could be indications of new physics and/or of some exotic effects already postulated by theory. In this talk we will focus our attention on two different possible sectors of analysis: the searches for Lorentz Invariance Violation (LIV) and for Non Standard Neutrino Interactions (NSI).
The LIV effects (that could be also interpreted as “low energy” phenomenological manifestations of very high energy quantum gravity theories) could in principle affect the oscillation probability with deviations from the standard scenario, that can be investigated in experiments studying high energy atmospheric and cosmic neutrinos. We will discuss this possibility with particular attention to the search for isotropic effects predicted by models like the HMSR model, on which we have been working.
Concerning the NSI effects, they can be investigated mainly in solar neutrino physics, with particular attention to the ^7Be and even more to the ^8B part of the spectrum, looking for possible deviations from the traditional MSW scenario especially in the vacuum to matter transition region. The search for these signals can be conducted by experiments with high masses and good energy resolution, to guarantee high statistics and a detailed study of the spectrum. Important synergies could come also from the combined analysis of the solar neutrino and the reactor antineutrino signals.

Speaker: Vito Antonelli (MI)

antonelli-v-neutel-2021.pdf

DOI # 10.5281/zenodo.4680539

Search for Non Standard Neutrino Interactions and other Lorentz Invariance Violation effects in neutrino physics

12:25 PM Discussion Time

2:00 PM → 3:30 PM Neutrino Masses and Mixings

Convener: Filippo Varanini (INFN Padova)

2:00 PM Neutrino, Solar and star physics wih Borexino

Speaker: Gianpaolo Bellini (MI)

Bellini_neutel 2021 V3.pdf

DOI # 10.5281/zenodo.5536407

neutel 2021 V2.pptx

Neutrino, Solar and star physics wih Borexino

2:30 PM Phenomenology of three neutrino oscillations

Speaker: Antonio Marrone (BA)

DOI # 10.5281/zenodo.5537022

Neutel2021_Marrone.pdf

Phenomenology of three neutrino oscillations

3:00 PM Reactor neutrinos (theta13 and steriles)

Speaker: Patrick Huber (Virginia Tech)

DOI # 10.5281/zenodo.5537043

neutel2021.pdf

Reactor neutrinos (theta13 and steriles)

3:30 PM → 3:45 PM Coffee Break

3:45 PM → 5:15 PM Neutrino Telescopes and MultiMessenger Astrophysics

Convener: Mathieu Lamoureux (INFN Padova)

3:45 PM KM3NeT

Speaker: Aart Heijboer

DOI # 10.5281/zenodo.5786382

KM3NeT

neutel_heijboer_v2.pptx

4:15 PM ANTARES

Speaker: Antoine Kouchner (APC - University parsi Diderot)

ANTARES

ANTARES_Neutel_vf.pdf

DOI # 10.5281/zenodo.5785926

4:45 PM Baikal

Speaker: Zhan-Arys Dzhilkibaev

Baikal

DOI # 10.5281/zenodo.5786438

NUTEL_2021_Dzhilkibaev.pdf

5:15 PM → 5:30 PM Coffee Break

5:30 PM → 6:50 PM Double Beta decays and Neutrino Masses: (Room 1)

Conveners: Chiara Sirignano (PD), Christian Farnese (PD)

5:30 PM The LEGEND neutrinoless double-beta decay program

The Large Enriched Germanium Experiment for Neutrinoless $\beta\beta$ Decay (LEGEND) program is a search for the neutrinoless double-beta decay of the $^{76}$Ge isotope. Its first phase, LEGEND-200, uses 200-kg of enriched high-purity germanium (HPGe) detectors in an active liquid argon shield and is currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It has a background index goal of $< 0.6$ counts/ (FWHM t yr), which yields a $3 \sigma$ discovery half-life sensitivity of beyond $10^{27}$ years with a 1 ton-year exposure. LEGEND-1000 is a proposed tonne-scale upgrade with 1000-kg of enriched HPGE detectors that will follow LEGEND-200. It will have a discovery sensitivity beyond $10^{28}$ years. This talk will provide a status update of LEGEND-200 and a review of the proposed LEGEND-1000. Other BSM searches possible in LEGEND are also briefly discussed.

Speaker: Reyco Henning (UNC Chapel Hill)

DOI # 10.5281/zenodo.5744838

The LEGEND neutrinoless double-beta decay program

The LEGEND neutrinoless double-beta decay program

5:50 PM Status of the Majorana Demonstrator

The Majorana Demonstrator is searching for neutrinoless double beta decay ($0\nu\beta\beta$) in $^{76}$Ge, a beyond the standard model second order nuclear process whose discovery would indicate that the neutrino is a Majorana fermion. The experiment consists of a modular array of 44 kg of p-type point contact (PPC) high-purity germanium detectors (HPGe), 30 kg of which are enriched to 88% in $^{76}$Ge. The Demonstrator is constructed from low-background materials and housed at the Sanford Underground Research Facility (SURF). Due to the PPC detector geometry, pulse shape analysis (PSA) cuts can reject many background events. In addition, the experiment has achieved a leading energy resolution of 2.5 keV FWHM at 2039 keV. With 26 kg-yr of exposure, the Majorana Demonstrator has achieved a half-life limit of $>2.7\times10^{25}$ yr at 90% CL. Recently, the experiment has undergone hardware upgrades, including the exchange of several PPC detectors for 4 Inverted Coaxial Point Contact (ICPC) detectors (6.7 kg) which will be used in future experiments. Many PSA routines have also been improved to improve efficiency, uniformity and stability. Many of the detectors, technology and analysis techniques developed by Majorana are being incorporated into LEGEND-200, the first phase of a next-generation search for $0\nu\beta\beta$ in $^{76}$Ge. This talk will present the current status and recent results of the Majorana Demonstrator.

Speaker: Ian Guinn (University of North Carolina at Chapel Hill)

210223_MJD_Overview.pdf

DOI # 10.5281/zenodo.5744896

Status of the Majorana Demonstrator

6:10 PM The nEXO search for neutrinoless double beta decay

The search for neutrinoless double beta decay (NDBD) provides the most sensitive experimental test of lepton number conservation, as well as a powerful experimental probe of the nature and mass scale of the neutrino. In this talk, I will introduce the nEXO experiment: a proposed next-generation search for the neutrinoless double beta decay of $^{136}$Xe with a halflife sensitivity of ~$10^{28}$ years, two orders of magnitude beyond existing experiments. Building on techniques developed for the successful EXO-200 experiment, the primary detector will be a five-tonne, monolithic liquid xenon time projection chamber (TPC) with a source enriched to 90% in $^{136}$Xe. We will discuss the science goals of nEXO, then describe how the experiment addresses the stringent low-background requirements of next-generation NDBD searches using a combination of conservative design choices (driven by EXO-200 experience) and novel readout schemes designed to improve the energy resolution and background rejection capabilities of the detector.

Speaker: Dr Brian Lenardo (Stanford University)

DOI # 10.5281/zenodo.5745010

Lenardo - NeuTel 2021 - The nEXO neutrinoless double beta decay experiment.pdf

The nEXO search for neutrinoless double beta decay

6:30 PM Tritium Results from Project 8 Phase II

Project 8 is a tritium endpoint neutrino mass experiment utilizing a phased program to achieve sensitivity to the range of neutrino masses allowed by the inverted mass ordering. The Cyclotron Radiation Emission Spectroscopy (CRES) technique is employed to measure the differential energy spectrum of relativistic decay electrons with high precision. In Phase II, the CRES technique was extended to make its first continuous spectrum measurement on the tritium endpoint. In this talk, we will highlight recent analysis progress towards the final results of Phase II. We will showcase the critical achievements of CRES in this small-scale apparatus, motivating scaling up the technique towards a next-generation neutrino mass experiment.

Speaker: Walter Pettus (Indiana University)

DOI # 10.5281/zenodo.5747331

pettus_neutel.pdf

Tritium Results from Project 8 Phase II

5:30 PM → 6:30 PM New Facilities: (Room 2)

Conveners: Andrea Longhin (PD), Luca Stanco (PD)

5:30 PM The GRAND observatory: Status and Future plans

The Giant Radio Array for Neutrino Detection (GRAND) is a proposed distributed observatory with a total area of 200,000 km2. This observatory will not only be sensitive to Ultra-High-Energy (UHE) neutrinos, but also to UHE photons and UHE cosmic rays; making it a multi-messenger observatory at the highest energies. In this contribution, the current status of the GRAND project will be discussed, with an emphasis on the design of the antenna, our main detection element. In addition, the layout of the first site of 300 antennas (GRANDProto300), as well as the staged road towards the creation of the full detector and its physics potential will be discussed.

Speaker: Charles timmermans (Nikhef/Radboud University)

DOI # 10.5281/zenodo.5046113

GRAND_NeutrinoTelescopes2021.pptx

The GRAND observatory: Status and Future plans

5:50 PM Modeling the background for a neutrino search with the HAWC observatory

The search for neutrino signals using a surface detector array is a challenging task that requires a very good control of the large background the from cosmic radiation. In this work we propose to use the HAWC observatory, an ~22000 m^2 water Cherenkov detector array located at 4100 m a.s.l., to search for neutrino induced muons produced within the largest volcano in Mexico, located in close vicinity of the detector array. We present preliminary results of the background measured with HAWC and a method designed to disentangle the atmospheric muon background from the neutrino induced signals.

Speaker: Hermes León Vargas (Instituto de Física, Universidad Nacional Autónoma de Mexico)

DOI # 10.5281/zenodo.5046195

HAWCNeutObs2021VFR.pdf

Modeling the background for a neutrino search with the HAWC observatory

6:10 PM The Pacific Ocean Neutrino Explorer

Every time researchers have pushed the energy boundary in particle physics we have found something new about our Universe. Recently, IceCube has demonstrated that Neutrino Telescopes can use neutrinos from the cosmos as excellent tools to continue this exploration. The Pacific Ocean Neutrino Explorer (P-ONE) is a proposed initiative to construct one of the largest neutrino telescopes deep in the northern Pacific Ocean off the coast of British Columbia. To overcome the challenges of a deep-sea installation, we have deployed two prototype mooring lines STRAW and STRAW-b in 2018 and 2020. These provide continuous monitoring of optical water properties at a potential detector site in the Pacific. In this talk I will cover the latest results from these prototype lines and plans to deploy P-ONE off the coast of Vancouver Island.

Speaker: Dr Matthias Danninger (Simon Fraser University)

DOI # 10.5281/zenodo.5046273

P-ONE_NuWorkshop.pdf

The Pacific Ocean Neutrino Explorer

5:30 PM → 6:30 PM Sterile Neutrinos and New Physics: (Room 3)

Conveners: Filippo Varanini (INFN Padova), Mauro Mezzetto (PD)

5:30 PM MicroBooNE's Search for a Photon-Like Low Energy Excess

MicroBooNE is a Liquid Argon Time Projection Chamber detector that has been taking data since 2015. One of its primary goals is to investigate the unexplained excess of electromagnetic events in the lowest energy ranges observed by the MiniBooNE experiment located along the same neutrino beamline. While one leading interpretation of this anomaly is electron neutrino appearance due to sterile neutrino oscillations, a viable alternate interpretation is neutrino-induced single photon events. The MicroBooNE single photon analysis aims to test this interpretation by measuring the rate of neutrino-induced resonant neutral current (NC) delta baryon production and subsequent delta radiative decay with a single photon in the final state, NC Δ→N𝛾. This search for a process that has never been observed before in neutrino scattering is projected to improve upon the current experimental limit from T2K by greater than an order of magnitude. This talk will present the status of the MicroBooNE single photon analysis and the outlook for subsequent measurements.

Speaker: Mark Ross-Lonergan (Columbia University)

DOI # 10.5281/zenodo.5783963

MicroBooNE's Search for a Photon-Like Low Energy Excess

uBooNE_Mark_Ross_Lonergan_NeuTel2021.pdf.pdf

5:50 PM Search for electron-like low energy excess using Wire-Cell event reconstruction at MicroBooNE

The liquid argon time projection chamber (LArTPC) is an advanced technology to detect neutrinos with its superb imaging and calorimetry capabilities in a fully active volume. The MicroBooNE detector, which is a single-phase LArTPC of 85-ton active mass located near the Earth's surface, was built to primarily investigate the low energy excess (LEE) of electron neutrino charged-current events and to measure the neutrino-argon scattering cross sections, using the Booster Neutrino Beam (BNB) at Fermilab. The search for LEE is of great scientific interest in the context of the existence of light sterile neutrinos.
In this talk, an end-to-end reconstruction, selection, and analysis chain of electron neutrino charged-current events based on the novel Wire-Cell reconstruction paradigm will be presented. The unique challenges of the large cosmic-ray muon backgrounds at a surface detector and the overwhelming charged-current and neutral-current backgrounds from the beam muon neutrinos are well addressed in this procedure. Validation of this electron neutrino selection using the Neutrinos at the Main Injector Beam (NuMI) will be shown as well.

Speaker: Hanyu Wei

DOI # 10.5281/zenodo.5783885

NeuTel_WireCell_eLEE.pdf

Search for electron-like low energy excess using Wire-Cell event reconstruction at MicroBooNE

6:10 PM Astrophysics and BSM Physics Capabilities and Results from MicroBooNE

MicroBooNE is an 85-ton active mass liquid argon time projection chamber (LArTPC) at Fermilab. Its excellent calorimetry and resolution, along with its exposure to two neutrino beamlines make it a powerful detector not just for neutrino physics, but also for Beyond the Standard Model (BSM) physics and astrophysics. The experiment has competitive sensitivity to Heavy Neutral Leptons arising in the leptonic decay modes of kaons, and also to light scalars that can be produced in association with pions. In addition, MicroBooNE serves as a platform for prototyping searches for rare events in the future Deep Underground Neutrino Experiment (DUNE). This talk will explore the capabilities of LArTPCs for BSM physics and astrophysics and highlight some recent results from MicroBooNE.

Speaker: Pawel Guzowski (University of Manchester)

Astrophysics and BSM Physics Capabilities and Results from MicroBooNE

DOI # 10.5281/zenodo.5783936

pguzowski_neutel_20210223.pdf

Wednesday, February 24

10:00 AM → 11:20 AM Double Beta decays and Neutrino Masses: (Room 1)

Conveners: Christian Farnese (PD), Fabio Pupilli (PD)

10:00 AM .

10:20 AM CUPID: a next generation bolometric neutrinoless double beta decay experiment

CUPID is a next-generation tonne-scale bolometric neutrinoless double
beta decay experiment to probe the Majorana nature of neutrinos and
discover Lepton Number Violation if the effective neutrino mass is
greater than 10 meV. CUPID will be built on experience, expertise and
lessons learned in CUORE, and will be installed in the current CUORE
infrastructure in the Gran Sasso underground laboratory. The CUPID
detector technology, successfully tested in the CUPID-Mo experiment, is
based on scintillating bolometers of Li2MoO4 enriched in the isotope of
interest 100Mo. In order to achieve its ambitious science goals, CUPID
aims to reduce the backgrounds in the region of interest by a factor 100
with respect to CUORE. This performance will be achieved by introducing
the high efficiently alpha/beta discrimination demonstrated by the
CUPID-0 and CUPID-Mo experiments, and using a high transition energy
double beta decay nucleus such as 100Mo to minimize the impact of the
gamma background. CUPID will consist of about 1500 hybrid heat-light
detectors for a total isotope mass of 250 kg. The CUPID scientific reach
is supported by a detailed and safe background model that uses CUORE,
CUPID-Mo and CUPID-0 results. The required performance
in terms of energy resolution, alpha rejection factor and crystal purity
have already been demonstrated and will be presented.

Speaker: Andrea Giuliani (CUPID collaboration)

CUPID-giuliani-neutel-2021_v5.pdf

CUPID: a next generation bolometric neutrinoless double beta decay experiment

DOI # 10.5281/zenodo.5750166

10:40 AM The CUPID-Mo experiment for the search of neutrinoless double beta decay

The CUPID-Mo experiment is devoted to the search of neutrinoless double beta decay, 2β0ν. This small-scale array of scintillating bolometers has set in 2020 the best limit to the half-live of 2β0ν in 100Mo, with 2.17 kg x y of exposure. CUPID-Mo has demonstrated the maturity of the scintillating bolometric technique for CUPID (Cuore Upgrade with Particle Identification), the next generation 2β0ν ton-scale cryogenic experiment.
CUPID-Mo consists of 20 enriched Li2100MoO4 scintillating crystals, at the Laboratoire Souterrain de Modane (France). The simultaneous measurement of heat and light allows rejecting the α background.
In this talk we will present the data analysis corresponding to a 380 day period acquired between March 2019 and April 2020. This analysis lead to the new limit on 2β0ν in 100Mo of T1/2 > 1.5 x 10^24 yr at 90% CI, corresponding to an effective Majorana mass < (0.31 – 0.54) eV.

Speaker: Pia Loaiza

CUPID_Mo.pdf

DOI # 10.5281/zenodo.5750134

The CUPID-Mo experiment for the search of neutrinoless double beta decay

11:00 AM First KATRIN results: search for light sterile neutrinos

I will report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. The analysis of the spectral shape of the spectrum near the endpoint leads to an improvement over the previous direct measurement of the neutrino mass, with a new upper limit of 1.1 eV at 90% C.L. Analyzing the shape of the whole spectrum down to 40 eV below the endpoint, we find no significant distortion compared to the standard model expectation. Therefore, exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound. The reactor and gallium anomalies are further constrained.

Speaker: Mr Thierry Lasserre (CEA)

DOI # 10.5281/zenodo.5750176

First KATRIN results: search for light sterile neutrinos

KATRIN-NeutrinoTelescope2021.pdf

10:00 AM → 11:20 AM Low Energy Neutrinos: (Room 2)

Conveners: Gianmaria Collazuol (PD), Mathieu Lamoureux (INFN Padova)

10:00 AM .

10:20 AM Sensitivity to CNO cycle solar neutrinos in Borexino

The Borexino detector, located at the Laboratori Nazionali del Gran Sasso in Italy, is a liquid scintillator detector with a primary goal to measure solar neutrinos. The sub-dominant $\textrm{CNO}$ cycle in the Sun is assumed to be the main energy production mechanism in heavier stars. The existence of this fusion process in Nature has been recently confirmed by Borexino (5$\sigma$ C.L.) for the first time through the detection of neutrinos from the $\textrm{CNO}$ cycle in the Sun. A direct measurement of this fusion process is challenging due to the high spectral correlation with the detector background $^{210}\textrm{Bi}$ and the solar $pep$ neutrino signal. In order to prove the sensitivity to $\textrm{CNO}$ neutrinos, a dedicated toy Monte Carlo procedure is needed to evaluate the discovery potential applying separate constraints on the $^{210}\textrm{Bi}$ and $pep$ neutrino interaction rates. Here, the Standard Solar Model predictions for low- and high-metallicity are used as inputs for the simulation studies. In the so-called Borexino Phase-III, namely the data-taking period from July 2016 to February 2020, the sensitivity is compatible with the significance observed on data. In this talk, the Borexino sensitivity study to $\textrm{CNO}$ neutrinos is presented.

Speaker: Oemer Penek (IKP Forschungszentrum Jülich)

DOI # 10.5281/zenodo.4709040

Penek_NeuTel_Sensitivity_24th_Feb_2021_vFinal.pdf

Sensitivity to CNO cycle solar neutrinos in Borexino

10:40 AM Feasibility and physics potential of detecting 8B solar neutrinos at JUNO

The Jiangmen Underground Neutrino Observatory (JUNO) features a 20 kt multi-purpose underground liquid scintillator sphere as its main detector. Some of JUNO's features make it an excellent experiment for $^8$B solar neutrino measurements, such as its low-energy threshold, its high energy resolution compared to water Cherenkov detectors, and its much large target mass compared to previous liquid scintillator detectors. In this talk, we present a comprehensive assessment of JUNO's potential for detecting $^8$B solar neutrinos via the neutrino-electron elastic scattering process. A reduced 2 MeV threshold on the recoil electron energy is found to be achievable assuming the intrinsic radioactive background $^{238}U$ and $^{232}Th$ in the liquid scintillator can be controlled to 10$^{-17}$ g/g. With ten years of data taking, about 60,000 signal and 30,000 background events are expected. This large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter, which will shed new light on the tension between the measured electron spectra and the predictions of the standard three-flavor neutrino oscillation framework. If $\Delta m^{2}_{21}=4.8\times10^{-5}~(7.5\times10^{-5})$ eV$^{2}$, JUNO can provide evidence of neutrino oscillation in the Earth at the about 3$\sigma$ (2$\sigma$) level by measuring the non-zero signal rate variation with respect to the solar zenith angle. Moveover, JUNO can simultaneously measure $\Delta m^2_{21}$ using $^8$B solar neutrinos to a precision of 20% or better depending on the central value and to sub-percent precision using reactor antineutrinos. A comparison of these two measurements from the same detector will help elucidate the current tension between the value of $\Delta m^2_{21}$ reported by solar neutrino experiments and the KamLAND experiment.

Speaker: Jie Zhao (Institute of High Energy Physics (IHEP))