Conveners
Dark Matter
- Marco Selvi (Istituto Nazionale di Fisica Nucleare)
Dark Matter
- Marco Selvi (Istituto Nazionale di Fisica Nucleare)
Dark Matter
- Priscilla Pani (DESY)
Dark Matter
- Priscilla Pani (DESY)
Dark Matter
- Priscilla Pani (DESY)
Dark Matter
- koun choi (IBS)
Dark Matter
- koun choi (IBS)
Dark Matter
- Marco Selvi (Istituto Nazionale di Fisica Nucleare)
Dark Matter
- Marco Selvi (Istituto Nazionale di Fisica Nucleare)
Dark Matter
- koun choi (IBS)
Dark Matter
- koun choi (IBS)
In this talk, Iโll present results from a global fit of Dirac fermion dark matter (DM) effective field theory using the GAMBIT software. We include operators up to dimension-7 that describe the interactions between gauge-singlet Dirac fermion and Standard Model quarks, gluons, and the photon. Our fit includes the latest constraints from the Planck satellite, direct and indirect detection...
The stability of particles in the cosmic soup is an important property as it governs their evolution in the cosmos, both on the perturbation and on the background level. In this work, we update the constraints on the decay rate of decaying cold dark matter (DCDM), particularly in the case when decay products are dark and massless or well within the relativistic limit. We further assume, as a...
Dark matter interactions with Standard Model particles can inject energy at early times, altering the standard evolution of the early universe. In particular, this energy injection can perturb the spectrum of the cosmic microwave background (CMB) away from that of a perfect blackbody.ย For this study, I will discuss recent work to update the DarkHistory code package to more carefully track...
Relativistic protons and electrons in the extremely powerful jets of blazars may boost via elastic collisions the dark matter particles in the surroundings of the source to high energies. The blazar-boosted dark matter flux at Earth may be sizeable, larger than the flux associated with the analogous process of DM boosted by galactic cosmic rays, and relevant to access direct detection for dark...
We consider the well-motivated scenario of dark matter annihilation with a velocity-dependent cross section. At higher speeds, dark matter annihilation may be either enhanced or suppressed, which affects the relative importance of targets like galactic subhalos, the Galactic Center, or extragalactic halos. We consider a variety of new strategies for determining the associated J-factors, and...
The large gap between a galactic dark matter subhalo's velocity and its own gravitational binding velocity creates the situation that dark matter soft-scattering on baryons to evaporate the subhalo, if kinetic energy transfer is efficient by low momentum exchange. Small subhalos can evaporate before dark matter thermalize with baryons due to the low binding velocity. In case dark matter...
The nature of Dark Matter (DM) is one of the greatest puzzles of modern particle physics and cosmology. Dark Matter characterisation requires systematic and consistent approach for DM theory space. We propose a first complete classification of minimal consistent Dark Matter models, which provides the missing link between experiments and top-down models. Consistency is achieved by imposing...
Dark sectors containing light vectors or scalars may feature sizeable self-interactions between dark matter (DM) particles and are therefore of high phenomenological interest. Self-interacting dark matter appears to reproduce the observed galactic structure better than collisionless DM and may offer a dynamical explanation for the scaling relations governing galactic halos all the way up to...
Based on the example of the currently widely studied t-channel simplified model with a colored mediator, I will demonstrate the importance of considering non-perturbative effects such as the Sommerfeld effect and bound state formation for accurately predicting the relic abundance and hence correctly inferring the viable model parameters. For instance, I will highlight that the parameter space...
New ''dark'' fermionic fields charged under a confining dark group ($\text{SU}(N)$ or $\text{SO}(N)$) can come as embeddings in SU(5) multiplets to explain dark matter (DM). These fermions would form bound states due to the confining nature of the dark gauge group. Such dark baryons could prove to be a good neutral DM candidate stable due to a dark baryon number. DM relic abundance sets the...
We examine the dynamics of quarks and gauge fields in QCD and QED
interactions in the lowest energy states with approximate cylindrical
symmetry, in a flux tube model. Using the action integral, we
separate out the (3+1)D in terms of the transverse and the
longitudinal degrees of freedom and solve the resultant equations of
motion. We find that there may be localized and stable states...
We suggest a new class ofย models โย Fermionic Portal Vector Dark Matter (FPVDM) which extends the Standard Model (SM) withย $SU(2)_D$ dark gauge sector. While FPVDM does not require kinetic mixing and Higgs portal,ย It is based on the Vector-Like (VL) fermionic doubletย which couples the dark sector with the SM sector through the Yukawa interaction. The FPVDM model provides a vector Dark...
The Dark Higgs model is an extension of the Standard Model that describes the phenomenology of dark matter while respecting the SM gauge symmetries. This new approach opens regions of parameter space that are less covered by searches optimized for simpler models of dark matter. In this talk, we present such searches from CMS, focusing on the recent results obtained using the full Run-II...
Searches in CMS for dark matter in final states with invisible particles recoiling against visible states are presented. Various topologies and kinematic variables are explored, including jet substructure as a means of tagging heavy bosons. In this talk, we focus on the recent results obtained using the full Run-II dataset collected at the LHC.
The LHCb detector at the LHC offers unique coverage of forward rapidities. The detector also has a flexible trigger that enables low-mass states to be recorded with high efficiency, and a precision vertex detector that enables excellent separation of primary interactions from secondary decays. This allows LHCb to make significant (and world-leading) contributions in these regions of phase...
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM,...
The discovery of dark matter is one of the challenges of high-energy physics in the collider era. Many Beyond-Standard Model theories predict dark matter candidates associated with the production of a single top-quark in the final state, the so-called mono-top. A search for events with one top quark and missing transverse energy in the final state is presented. This analysis explores the fully...
Belle has unique reach for a broad class of models that postulate the existence of dark matter particles with MeVโGeV masses. This talk presents recent world-leading physics results from Belle II searches for dark Higgstrahlung and invisible $Z^{\prime}$ decays; as well as the near-term prospects for other dark-sector searches.
The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for the origin of dark matter sharpen the focus on a narrower range of masses: the natural scenario where dark matter originates from thermal contact with familiar matter in the early Universe requires the DM mass to lie within about an MeV to 100 TeV. Considerable...
High energy e$^+$e$^-$ colliders offer unique possibility for the most general dark matter search based on the mono-photon signature. Analysis of the energy spectrum and angular distributions of photons from the initial state radiation can be used to search for hard processes with invisible final state production.
Most studies in the past focused on scenarios assuming heavy mediator exchange....
Extensions of the Two Higgs Doublet model with a complex scalar singlet (2HDMS) can accommodate all current experimental constraints and are highly motivated candidates for Beyond Standard Model Physics. It can successfully provide a dark matter candidate as well as explain baryogenesis and provides gravitational wave signals. In this work, we focus on the dark matter phenomenology of the...
The quest for new physics beyond the Standard Model is boosted
by the recently observed deviation in the anomalous magnetic moments of
muon and electron from their respective theoretical prediction.
In the present work, we have proposed a suitable
extension of the minimal $L_{\mu}-L_{\tau}$ model to address
these two experimental results as the minimal
model is unable to provide any...
We consider the direct-detection rate for Majorana dark matter scattering
off nuclei in an SU(2) ร U(1) invariant effective theory and we compare it against the LHC reach. Current constraints from direct detection experiments are already bounding the mediator mass to be well into the TeV range for WIMP-like scenarios. This motivates a consistent and systematic exploration of the parameter...
In scenarios with very small dark matter (DM) couplings and small mass splittings between the DM and other dark-sector particles, so-called "coscattering" or "conversion-driven freeze-out" can be the dominant mechanism for DM production. We present the inclusion of this mechanism in micrOMEGAs together with a case study of the phenomenological implications in the singlet-triplet model. For the...
The super-weak model is a particle physics model which extends the Standard Model (SM) by a new U(1) gauge symmetry. In addition to the new mediator $Z'$, a scalar particle $\chi$ is added to deal with the meta-stability of the SM vacuum, and right-handed neutrinos are introduced to account for the non-vanishing neutrino masses. In this talk, we investigate the cosmological implications of...
We perform an analysis of leptogenesis in the context of a simple extension of the Standard Model with two fermions, one charged ($\chi $) and one neutral ($\psi$), in addition to three right-handed neutrinos, interacting through a charged gauge singlet scalar $S$. The dark sector ($\chi$, $\psi$ and $S$) interacts feebly and produces a relic density consistent with the existing data. The ...
Present and upcoming neutrino experiments can be used to probe Dark Sectors (DS).
We consider light DS interacting with the SM through well-motivated irrelevant portals. In our model independent approach, the DS is only characterized by two scales: the cut-off scale ฮUV of the irrelevant portals , and the mass gap ฮIR of the DS, identified with the mass of its lightest particle (LDSP). If the...
We discovered a chiral enhancement in the production cross-sections of massive spin-2 gravitons, below the electroweak symmetry breaking scale, that makes them ideal dark matter candidates for the freeze-in mechanism. The result is independent on the physics at high scales, and points towards masses in the MeV range. The graviton is, therefore, a warm dark matter particle, as favoured by the...
We study a minimal model of pseudo-Dirac dark matter, interacting through transition electric and magnetic dipole moments. Motivated by the fact that xenon experiments can detect electrons down to โผkeV recoil energies, we consider O(keV) splittings between the mass eigenstates. We study the production of this dark matter candidate via the freeze-in mechanism. We discuss the direct detection...
We study scenarios where Dark Matter is a weakly interacting particle (WIMP) embedded in an ElectroWeak (EW) multiplet. In particular, we consider both real SU(2) representations with hypercharge $Y=0$, that automatically avoid direct detection constraints from tree-level $Z$-exchange, and complex ones with $Y\neq 0$. In the latter case, the minimal inelastic splitting between the DM and its...
The excess of gamma rays in the data measured by the Fermi Large Area Telescope from the Galactic center region is one of the most intriguing mysteries in Astroparticle Physics. This Galactic center excess (GCE), has been measured with respect to different interstellar emission models, source catalogs, data selections and techniques. Although several proposed interpretations have appeared in...
The detection of line-like TeV gamma-ray features configures as a smoking gun for the discovery of TeV-scale particle dark matter. We report the first search for dark matter spectral lines in the Galactic Centre region up to gamma-ray energies of 100 TeV with the MAGIC telescopes, located on the Canary island of La Palma (Spain). This region is expected to host the most easily detectable dark...
Precision measurements of cosmic ray positrons are presented up to 1.4 TeV based on 3.4 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are: (a) a significant excess starting from 24.2 GeV compared to the lower-energy, power-law trend; (b) a sharp drop-off above...
The fluxes and flux ratios of charged elementary particles in cosmic rays are presented in the absolute rigidity range from 1 up to 2000 GV. In the absolute rigidity range โผ60 to โผ500 GV, the antiproton and positron fluxes are found to have nearly identical rigidity dependence. In this presentation particular emphasis is made on new observations of the properties of elementary particles in the...
Extraterrestrial neutrinos can be used as messengers to probe the presence of dark matter particles in our Galaxy. Indeed, sizable fluxes of high-energy neutrinos are expected from pair annihilation and decay of dark matter in regions where it accumulates to a high density. Massive celestial bodies such as the Sun and the very large reservoir at the centre of the Milky Way were inside the...
Neutrino detectors, such as the IceCube telescope, can be used to perform indirect dark matter searches. Under the assumption that dark matter is made of Weakly Interacting Massive Particles (WIMPs), Standard Model particles are expected to be created by its annihilation or decay. These Standard Model particles could in turn produce neutrinos detectable by the IceCube neutrino telescope. As...
The General Antiparticle Spectrometer (GAPS) is the first experiment optimized to identify low-energy (<0.25 GeV/n) cosmic antinuclei, in particular antideuterons from dark matter annihilation or decay. Using a novel detection approach which relies on exotic atom formation and decay, the GAPS program will deliver an unprecedented sensitivity to cosmic antideuterons, an essentially...
Space: the final frontier for antinuclei physics. There, antinucleosynthesis models already tested on the bench of hadronic colliders and particle physics experiments are put at work to crack one of the biggest problems of modern physics: the existence and nature of dark matter.
In fact, the observation of an antinucleus in cosmic rays would most probably mean a breakthrough in searches for...
I describe a reanalysis of data sets that have previously been found to harbor evidence for an unidentified X-ray line at 3.5 keV in order to quantify the robustness of earlier results that found significant evidence for a new X-ray line at this energy. The 3.5 keV line is intriguing in part because of possible connections to dark matter. We analyze observations from the XMM-Newton and...
The Milky Way galactic center has been broadly explored looking for indirect dark matter (DM) signals. However, younger galaxies, such as Centaurus A, are expected to gather a much higher DM component due to the formation of a density spike which would have survived to date contrary to the case of our Galaxy.
In this talk, I will present indirect photon signatures of leptophilic DM coming...
Neutron stars harbour matter under extreme conditions, providing a unique testing ground for fundamental interactions.
Dark matter can be captured by neutron stars via scattering, where kinetic energy is transferred to the star.
This can have a number of observational consequences, such as theheating of old neutron stars to infra-red temperatures.
Previous treatments of the capture process...
We discuss indirect searches for sub-GeV dark matter (DM) that annihilates directly to a neutrino pair or a pair of new bosons subsequently decaying to neutrinos. The neutrino spectrum from the DM annihilation is monochromatic in the former process and a polynomial shape in the latter case. As a benchmark scenario, we consider a gauged U(1)$_{L_\mu-L_\tau}$ model under which a DM field is...
The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment explores with high sensitivity the parameter space of low mass DM candidates, being the pathfinder in the sub-GeV/c2 mass range. CRESST employs different high-purity crystals and operate them at mK temperature as cryogenic calorimeters. The flexibility in employing detectors made of different materials...
SENSEI (Sub-Electron Noise Skipper Experimental Instrument) is pioneering the development of silicon CCDs with sub-electron charge resolution for low-threshold direct detection of dark matter.
These "skipper CCDs" are the first detectors capable of resolving single electrons in each of millions of pixels, and the low thresholds possible with this technology give SENSEI world-leading...
The DAMIC-M (DArk Matter In CCDs at Modane) experiment will use n-type Si skipper CCDs, fully depleted, with a total target mass of about one kilogram. Four individual silicon plates of 6k x 1.5k pixels will be placed in each holder making a total of around 200 CCDs. The skipper amplifier readout allows for several non-destructive measurements of the individual pixel charge, reducing the...
The ANDROMeDa (Aligned Nanotube Detector for Research On MeV Darkmatter) project aims to develop a novel Dark Matter (DM) detector based on carbon nanotubes: the Dark-PMT. The detector is designed to be sensitive to DM particles with mass between 1 MeV and 1 GeV. The detection scheme is based on DM-electron scattering inside a target made of vertically-aligned carbon nanotubes. Carbon...
The NEWS-G collaboration is searching for light dark matter using spherical proportional counters. Access to the mass range from 50 MeV to 10 GeV is enabled by the combination of low energy threshold, light gaseous targets (H, He, Ne), and highly radio-pure detector construction. Initial NEWS-G results obtained with SEDINE, a 60 cm in diameter spherical proportional counter operating at the...
COSINE-100 is a NaI-based dark matter detection experiment based at the Yangyang Underground Laboratory in South Korea. By searching for an annual modulation signal in NaI crystals, COSINE-100 aims to provide a model-independent test of the long-standing but contested positive dark matter signal from experiments by the DAMA collaboration using the same target material and search method. In...
The SABRE project aims to produce ultra-low background NaI(Tl) scintillating detectors to carry out a model-independent search for dark matter through the annual modulation signature, with an unprecedented sensitivity to confirm or refute the DAMA/LIBRA claim. The ultimate goal of SABRE is to operate two independent NaI(Tl) crystal arrays located in the northern (SABRE North) and southern...
Today, the situation in direct dark matter detection is puzzling: the DAMA/LIBRA experiment observes an annual modulation signal at high statistical significance and fitting to the expectation of a cold dark matter halo in the milky way. However, in the so-called standard scenario on dark matter halo and dark matter interaction properties, the DAMA/LIBRA signal contradicts the null-results of...
Despite great efforts to directly detect dark matter (DM), experiments so far have found no evidence. The sensitivity of direct detection of DM approaches the so-called neutrino floor below which it is hard to disentangle the DM candidate from the background neutrino. One of the promising methods of overcoming this barrier is to utilize the directional signature that both neutrino- and...
The CYGNUS proto-collaboration aims to establish a Galactic Directional Recoil Observatory at the ton-scale that could test the DM hypothesis beyond the Neutrino Floor and measure the coherent and elastic scattering of neutrinos from the Sun and possibly Supernovae. A unique capability of CYGNUS will be the detailed measurement of topology and direction of low-energy nuclear and electron...
DEAP-3600 is a WIMP dark matter direct-detection experiment located 2 km underground at SNOLAB near Sudbury, Ontario in Canada, which uses liquid argon as the target material. The detector consists of 3.3 tonnes of liquid argon in a large acrylic cryostat instrumented with 255 photomultiplier tubes. This experiment has set the most stringent limits in argon for WIMP-nucleon spin-independent...
DarkSide run since mid-2015 a 50-kg-active-mass dual-phase Liquid Argon Time Projection Chamber (TPC), filled with low radioactivity argon from an underground source and produced world-class results for both the low mass ($M_{WIMP}< 20 GeV/c^2$) and high mass ($M_{WIMP} > 100 GeV/c^2$) direct detection search for dark matter.
The next stage of the DarkSide program will be a new generation...
XENONnT is a dark matter direct detection experiment located at the INFN Laboratori Nazionali del Gran Sasso. The core detector is a dual-phase time projection chamber (TPC) filled with 5.9 t of liquid xenon and instrumented with a total of 494 photomultiplier tubes (PMTs).
The TPC is installed in the center of a stainless steel tank filled with 700 t of water, which provides effective...
LUX-ZEPLIN (LZ) is a direct detection dark matter experiment located at the Sanford Underground Research Facility in Lead, South Dakota. The experiment consists of three nested detectors; a dual phase xenon TPC, an actively instrumented liquid xenon skin, and an outer detector neutron veto formed by 10 acrylic tanks of gadolinium-loaded liquid scintillator. The active region of the xenon TPC...
PandaX experiment uses xenon as target to detect weak and rare physics signals, including dark matter and neutrinos. We are running a new generation detector with 4-ton xenon in the sensitive volume, PandaX-4T. The commissioning run data has pushed the constraints on WIMP-nucleon scattering cross section to a new level. This talk will give an overview of PandaX-4T experiment and data-taking....
this talk will review the main scientific goal of the DARWIN experiment: the 40 ton dual-phase Xenon TPC for WIMP dark matter search. Dark matter experiments with target masses beyond the ton scale are already reality: the XENONnT detector is currently taking its first science run data. In case of a positive dark matter detection in this detector a larger instrument will be required in order...
The PICO-60 C$_3$F$_8$ dark matter detector is a bubble chamber consisting of 52 kg of C$_3$F$_8$ operating at 2.45-keV and 3.29-keV thermodynamic thresholds, reaching exposures of 1404-kg-day and 1167-kg-day, respectively. The detector was located at SNOLAB, 2 km underground in Sudbury, Ontario in Canada. This experiment set the most stringent direct-detection constraints to date on the...
PROSPECT is a reactor antineutrino experiment designed to search for short-baseline sterile neutrino oscillations and to perform a precise measurement of the U-235 reactor antineutrino spectrum. The PROSPECT detector collected data at the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory, with the ~4-ton volume covering a baseline range of 7 m to 9 m. To operate in this...
We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a U(1) extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays...
Despite the lack of experimental confirmation of the Migdal effect, several underground direct dark matter experiments are exploiting this rare atomic phenomenon to extend their sensitivity to light WIMP-like candidates. However, this effect is yet to be observed in nuclear scattering. The Migdal in Galactic Dark mAtter expLoration (MIGDAL) experiment aims to make the first unambiguous...
The quest for Dark Matter (DM) and its nature has been puzzling scientists for nearly a century. This puzzle has engendered theories that span nearly hundred orders of magnitude in mass scales with widely contrasting nature. It has also motivated decades of experimental efforts correspondingly different in the wide variety of their target masses, observables, technologies and interpretations....
