In the recent past, substantial effort has been devoted to exploring flavour symmetries to solve the flavour puzzle. However, traditional flavour symmetry models proved to be quite unsatisfactory. In 2017, a new 'bottom-up' approach based on modular invariance was suggested, wherein the Yukawa couplings of the Standard Model become modular forms. Within this framework, we addressed the...
DUNE is a leading-edge experiment for neutrino oscillation physics and is currently under construction in the United States, between Fermilab, where neutrino beam is generated, and the SURF underground laboratory, in South Dakota, hosting the Far Detector at a depth of 4,850 mwe and at a baseline of nearly 1,300 km.
GRAIN (GRanular Argon for Interactions of Neutrinos) is the Liquid Argon...
The Central Molecular Zone is a specific region of few hundred parsecs in the centre of our Galaxy that has an estimated gas density two orders of magnitude larger than the galactic average one and represents $5\%$ of the whole galaxy gas mass. It contains some of the most massive molecular clouds such as Sgr A, Sgr B, and Sgr C as well as potential local Pevatrons. These conditions underline...
We study the conditions under which the Majorana phase of the two flavor neutrino mixing matrix appears in the oscillation probabilities and causes $CP$ violation. We find that the Majorana phase remains in the neutrino evolution equation if the neutrino decay eigenstates are not aligned with the mass eigenstates. We show that, in general, two kinds of $CP$ violation are possible: one due to...
CUPID (CUORE Upgrade with Particle Identification) is a next-generation experiment that will be located at the LNGS and will serve as an observatory for rare events. Its main goal is to search for the neutrinoless double-beta decay of $^{100}$Mo. It will include an array of around 1600 cubic $45\times45\times45$ mm$^3$ Li$_2$MoO$_4$ enriched crystals operating as scintillating cryogenic...
Detectors for low-energy particles (MeV) are often calibrated using gamma rays to induce electron-like signals. Yet the energies of standard calibration sources are often not sufficient. For instance, the JUNO reactor neutrino experiment requires excellent understanding of the energy response to energies of 8 MeV and higher. The MANGO experiment will use 9 MeV gamma rays from neutron capture...
The dark matter direct detection experiment XENONnT searches for rare events such as dark matter recoils and solar pp neutrino signals. It requires accurate estimates of background events. The radioactive isotope 85Kr in the target material, liquid xenon, is one of background sources. To determine its abundance accurately, delayed coincidence counting of 85Kr has been introduced. This poster...
The Tokai to Kamioka (T2K) experiment is a long baseline neutrino experiment in Japan. We measure neutrino oscillations in the T2K experiment by using an almost pure muon neutrino beam produced at J-PARC accelerator facility. In December 2023, J-PARC achieved operation at 760 kW, exceeding its original design power. The T2K experiment plans to further increase the proton beam power to 1.3 MW...
The Jiangmen Underground Neutrino Observatory (JUNO) experiment is a multipurpose neutrino experiment under construction in South China. This next-generation large-scale detector, featuring a 20-kiloton liquid scintillator target, is primarily designed to study reactor antineutrinos emitted from two nearby nuclear power plants.
JUNO sits at a baseline of approximately 52.5 km, corresponding...
We explore the connection between low-scale CP-violating Dirac phase~$(\delta)$ and high-scale leptogenesis in a Left-Right Symmetric Model (LRSM) with scalar bidoublet and doublets. The fermion sector of the model is extended with one sterile neutrino~$(S_L)$ per generation to implement a double seesaw mechanism in the neutral fermion mass matrix. The double seesaw is performed via the...
Modular symmetries are a novel approach to understanding the flavour structure of leptonic mixing. Using the modular $A_4$ flavour symmetry integrated into a type-II seesaw, we propose a simple and minimalistic model that restricts the neutrino oscillation parameter space. Most importantly, this setup leads to a sum rule in the physical neutrino masses. When combined with the mass squared...
The ICARUS-T600 liquid argon time projection chamber (LArTPC) detector is currently taking data at shallow depth as the far detector of the Short Baseline Neutrino program at Fermilab, to search for a possible sterile neutrino signal at $\Delta m^{2} \approx 1\,\textnormal{eV}^{2}$ with the Booster (BNB) and Main Injector (NuMI) neutrino beams.
The ICARUS trigger system exploits the...
The phenomena of neutrino oscillations which confirms the non-zero masses of neutrinos, is the first firm experimental evidence of physics beyond the Standard Model(SM). According to SM neutrinos interact with matter through weak interactions mediating a W or Z bosons. The models describing Beyond Standard Model (BSM) physics often come with some additional unknown coupling of neutrinos termed...
Identifying cosmic objects that emit diverse messengers, such as photons, gravitational waves, and high-energy neutrinos, would provide unique insights into the properties and processes in the Universe and its active sources.
One of the most promising sources for common gravitational wave and neutrino emission are gamma ray bursts. From the release of a huge amount of energy in cosmic...
The identification of astrophysical sources responsible for the high-energy cosmic neutrinos is a longstanding challenge. In this context, an important breakthrough was the observation of the blazar TXS 0506+056, which was found in an enhanced gamma-ray emission state spatially and temporally coincident with an IceCube high-energy neutrino event for the first time. Subsequently, IceCube...
The Scattering and Neutrino Detector (SND@LHC) is a new experiment located in the TI18 tunnel at CERN, designed to measure neutrinos in an unexplored pseudo-rapidity region complementary to other experiments at the LHC. The detector consists of an 800 kg target of tungsten plates interleaved with emulsion and electronic trackers, followed downstream by a sampling calorimeter and a muon system....
The Neutrino Elastic Scattering Observation with NaI(Tl) (NEON) experiment aims to observe coherent elastic neutrino-nucleus scattering (CEvNS) using reactor electron antineutrinos with a 16.5 kg NaI(Tl) detectors. A novel crystal encapsulation technique has enhanced light collection efficiency, resulting in a yield of 22 to 25 photoelectrons per keV of light. The detection facility of the...
$U(1)$ extension of the Standard Model (SM) is well motivated, where the charges of SM fermions are fixed by gauge anomaly cancellations and Yukawa interactions. The scientific literature extensively covers the study of vector solutions in which SM fermions are vector-like under new $U(1)_X $ symmetry, allowing the Yukawa structure to remain invariant. On the other hand, chiral solutions in...
The exact sources of high-energy neutrinos detected by the IceCube neutrino observatory still remain a mystery. For the first time, this work explores the hypothesis that galaxy mergers may serve as sources for these high-energy neutrinos. Galaxy mergers can host very high-energy hadronic and photohadronic processes, which may produce very high-energy neutrinos. We perform an unbinned...
Within the DUNE next-generation neutrino oscillation experiment, the Near-Detector complex has the main aim of constraining systematic uncertainties, in order to allow precise oscillation measurements. The SAND detector is one of the three components of the Near Detector complex. Its aim is to monitor the neutrino beam from an on-axis position and carry out neutrino cross section measurements...
