Observation of neutrinoless double-beta decay (0$\nu\beta^{-}\beta^{-}$) would establish that neutrinos are Majorana particles (indistinguishable from their antiparticles) [1]. In spite of the formidable experimental challenges, it is an experimentally sensitive avenue to provide direct information on neutrino masses. The current work [2] would explore the required sensitivity for the upcoming...
Identification of electron neutrino interactions in liquid argon time projection chambers is essential to seeking answers to questions of the fundamental nature of neutrinos. These analyses include determining the ordering of the mass states and the value of the CP-violating phase in the neutrino sector in the Deep Underground Neutrino Experiment (DUNE), and performing neutrino oscillation...
In many rare event searches noble gases are deployed as detector target. In order to achieve higher sensitivities, purification systems ensure a low number of impurities by continuous circulating. To pump and compress xenon gas through such systems an ultra-clean, hermetically sealed, radon-free pump without oil lubrication is indispensable. Considering that the detectors of low background...
An ongoing analysis in IceCube regarding high-energy sterile neutrino oscillations is discussed. Matter-enhanced resonances for eV-scale sterile neutrinos with non-zero $\theta_{24}$ and $\theta_{34}$ lead to a strong enhancement of cascade-like event signatures through $\nu_{\mu}\to\nu_{s}\to\nu_{\tau}$ oscillations and allow for a direct $\nu_{\tau}$ appearance probe. Similar channels also...
We reconsider kinetically mixed dark photons as an explanation of the $(g-2)_\mu$ anomaly. While fully visible and invisible dark photon decays are excluded, a semi-visible solution can still explain the discrepancy. We explicitly re-evaluate the constraints from B-factories and fixed-target experiments, namely BaBar and NA64, pointing to a solution in terms of dark sector models with dark...
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...
Based on the IsoDAR 60 MeV/amu compact cyclotron design, which introduces several novel ideas for this type of particle accelerator, we describe a new family of high-current cyclotrons with energy from 1 to 60 MeV as a tool for particle physics, isotope production, and other uses. The design is modular, with design features upstream of 1 MeV identical for any energy and easily customized...
Photomultiplier tubes (PMTs) are widely used in scintillation and Cherenkov detectors for their great performances on photon detection. For example, the Jiangmen Underground Neutrino Observatory (JUNO) will use 17,612 20-inch PMTs in its central detector to achieve an unprecedented energy resolution of 3%/√𝐸. It’s critical to construct a reliable and accurate optical model to describe the...
An accurate atmospheric neutrino flux is crucial for a multitude of physics studies with the modern neutrino telescopes; as a signal for neutrino oscillation measurements, and as a background for searches of astrophysical neutrino sources. For precision calculations at energies below a few GeV, which are within reach of the IceCube Upgrade and KM3NeT-ORCA, the lateral component of hadronic...
We continue our discussions [1-5] about the electromagnetic properties of neutrinos and present an updated review on this topic. We start with a short introduction to the derivation of the general structure of the electromagnetic form factors of Dirac and Majorana neutrinos.
Then we consider experimental constraints on neutrino magnetic and electric dipole moments, electric millicharge,...
We discuss a new experiment based on the proposal [1] to observe for the first time the coherent elastic neutrino-atom scattering (CEνAS), using electron antineutrinos from tritium decay and a liquid He-4 target, and also to search neutrino electromagnetic properties [2,3], including the neutrino magnetic moment. The experiment is under preparation within the research program of the National...
BGO scintillator is widely used in particle physics experiments. It is also used in Super-Kamiokande to evaluate the efficiency of neutron tagging which can select electron antineutrino events via inverse beta decay process. A relative 10% discrepancy between the measured and simulated efficiency of neutron tagging was reported as systematic errors. A precise measurement of responses of the...
Icecube neutrino detector in last decade recorded an abundant noisy atmospheric rain of upward, contained, muon track neutrinos, up to TeVs energy. Their overabundance over electron atmospheric showers or cascade ones, had been well tested. Above tens TeV energy, the sudden overcome of shower or cascades rain, even within PeV energy (2013), the high energy starting events, HESE, more abundant...
Several anomalies over the last two decades point towards the existence of eV-scale sterile neutrino. In this work, we study the physics potential of two proposed long-baseline experimental set-ups in the presence of a light sterile neutrino, over a wide range of $\Delta m^2_{41}$ from $10^{-5}$ eV$^{2}$ to 10$^2$ eV$^2$. The first set-up consists of two Far Detectors (FD), namely Japanese...
During the modern era of high precision neutrino physics measurements it has become increasingly important to deepen our understanding
of detector performance. It is common for neutrino detector systems to
be fully or partially composed of polystyrene-based scintillator bars, and
most experiments now gather data for over a decade. Therefore it is crucial to investigate how the performance...
The KATRIN experiment aims to measure the neutrino mass via precision spectroscopy of the kinetic energy spectrum of tritium beta-decay with a target sensitivity of 0.2 eV/c² at 90% C.L. A high intensity windowless gaseous tritium source is used in conjunction with a high-resolution spectrometer applying the magnetic adiabatic collimation (MAC-E filter) technique to scan the beta-decay...
We find compact analytical expressions for neutrino oscillation probabilities, with invisible neutrino decay and matter effects included in 2-flavor and 3-flavor formalisms. The decay may be represented by an effective Hamiltonian which is non-Hermitian. The Hermitian and the anti-Hermitian components of this Hamiltonian need not commute; in the presence of matter, these components invariably...
This poster will present the sensitivity towards the detection of low-energy antineutrinos of the Theia detector. For the purposes of this study, we consider one of the possible proposed designs, a 25-ktonne Theia-25 detector filled with a water-based liquid scintillator (WbLS) placed at Sanford Underground Research Facility (SURF). Currently, only two detectors in the world have measured...
An accurate determination of the neutrino flux produced by the Neutrinos at the Main Injector (NuMI) and the Long-Baseline Neutrino Facility (LBNF) beamlines is essential to the neutrino oscillation and neutrino interaction measurements for the Fermilab neutrino experiments, such as MINERvA, NOvA, and the upcoming DUNE. In the current flux predictions, we use the Package to Predict the FluX...
In the IceCube South Pole Neutrino Observatory, looking at well reconstructed track events from the southern sky results in an event sample filled with atmospheric muons and neutrinos created in cosmic ray air showers that dominate over a signal of astrophysical neutrinos. However, selecting from these events tracks that start inside the detector allows you to not only reject the muon...
A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. The atmospheric oscillation probability calculation is one of the most time-consuming parts of the fit and demands precision due to direct impact on oscillation parameter constraints. As an alternative to the existing method of pre-computing...
The Project 8 experiment aims to make a direct measurement sensitive to much of the unexplored range of neutrino masses. Past experiments used molecular tritium, which has a large energy smearing from its final states. Project 8 will use atomic tritium to reach a design sensitivity of $m_\beta\mbox{}\leq\mbox{}40\mbox{ }$meV. This requires $\mathcal{O}(10^{20})$ tritium atoms held at tens of...
The goal of the KATRIN experiment is to measure the absolute mass of neutrinos with an unprecedented sensitivity of 0.2 eV/c².
To achieve this, understanding the background processes is of great importance. Currently, the background level exceeds the estimated design value by a factor of 15.
It is hypothesised that most of the measured background events originate from ionised Rydberg states...
The MAJORANA DEMONSTRATOR is a neutrinoless double-beta decay experiment located at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. The DEMONSTRATOR contains an array of 44 kg of Ge detectors, of which 30 kg are enriched in the neutrinoless double-beta decay candidate isotope $^{76}$Ge. From the initial 26 kg yrs of exposure, the count rate in the background estimation...
We present Beyond-the-Standard-Model (BSM) physics searches accessible to LEGEND-1000, a future neutrinoless double-beta decay (0νββ) experiment with the goal of 10 ton-years exposure. LEGEND-1000 will comprise a ton of High-purity Germanium detectors, enriched to more than 90% in $^{76}$Ge, surrounded by a 300 t of liquid argon (LAr) instrumented as an active radiation shield.
With its...
The present global analyses of the oscillation data do not agree on the octant in which the best-fit value of $\theta_{23}$ lies. Further, they allow $\sin^{2}\theta_{23}=0.5$ at 3$\sigma$ confidence level. Hence, it is imperative to question at what confidence level maximal 2-3 mixing can be ruled out. We study in detail the performance of DUNE to establish the deviation from maximal...
We present the status of the development of a Cherenkov telescope to be flown on an ultra-long-duration balloon flight, the Extreme Universe Space Observatory Super Pressure Balloon 2 (EUSO-SPB2). EUSO-SPB2 is an approved NASA balloon mission that is planned to fly in 2023 from Wanaka, New Zealand and is a precursor for future space-based missions to detect astrophysical neutrinos. The...
SuperNEMO is a neutrinoless double beta decay (0$\nu\beta\beta$) experiment, whose demonstrator module is located under the Frejus mountain in Modane, France, below 4800 m.w.e. It uses a unique technology combining a tracker and a calorimeter that allows it to unambiguously identify the two individual double-beta electrons, measure each particle's energy and their angular correlation. It aims...
Dark matter (DM) direct detection experiments are entering the multiple-ton era and will be sensitive to the coherent elastic neutrino nucleus scattering (CE$\nu$NS) of solar neutrinos, enabling the possibility to explore contributions from new physics with light mediators at the low energy range. In this paper we consider light mediator models (scalar, vector and axial vector) and the...
Heavy neutral leptons (HNL) are SM-gauge-singlet fermions that mix with active neutrinos. We argue that beam-dump and other limits on these mixings $U$ cannot be directly applied to HNLs that interact with a light SM-gauge-singlet scalar $s$ which mixes with the Higgs boson. We reinterpret the limits from the DELPHI, Belle, and CHARM experiments taking into account the new decay channel $N\to...
Here we are analysing the data from Borexino phase II and constraining some non standard models. Specially, for neutrino magnetic moment, new scalars, vector bosons and NSI.
Our knowledge about 3$\nu$ mixing angles and the CP-phase are becoming more accurate day-by-day. In this high-precision era of neutrino oscillation, it is inevitable to investigate the unitarity of the 3$\nu$ mixing matrix. In this work, we study the impact of possible non-unitary neutrino mixing (NUNM) in the context of next-generation long-baseline experiments DUNE and T2HKK having one...
It is well known that the neutrino medium, such as the cosmic neutrino background, produces a tiny birefringence effect on electromagnetic waves. Recently, it was claimed that this effect may be enhanced by an additional presence of a plasma characterized by the electron plasma frequency. In our work, instead of considering the plasma, we consider a simple transparent refractive medium...
The SNO+ detector is a multipurpose neutrino detector based at SNOLAB in the Creighton mine in Ontario, Canada. Due to the 6010m.w.e overburden at SNOLAB, SNO+ experiences an average of 3 high energy cosmogenic muons per hour passing through the 6m radius Acrylic Vessel. These muons can create spallation neutrons and long lived unstable isotopes that can present a background to the...
Any experiment aiming to measure coherent elastic neutrino-nucleus scattering (CEvNS) via nuclear recoils in cryogenic bolometers relies crucially on a precise detector calibration at sub-keV energies.
CRAB proposes a new calibration technique relying on the capture of thermal neutrons inside the target crystal. The subsequent emission of $\gamma$-rays of O(10 MeV) induces nuclear recoils at...
DANSS is a detector of reactor antineutrinos based on solid state scintillator
placed on a movable platform below the core of 3.1 GW industrial reactor of Kalininskaya NPP. DANSS detects up to 5000 neutrino events per day with the only 2% background. DANSS is collecting data for 6 years with more than 6 million inverse beta-decay events already collected. The primary goal of the experiment...
The Daya Bay Reactor Neutrino Experiment was designed with the primary goal of precisely measuring the neutrino mixing parameter, $\theta_{13}$. Eight identically-designed gadolinium-doped liquid scintillator detectors installed in three underground experimental halls measure the reactor antineutrinos from six nuclear reactors with different distances. Until its shutdown at the end of 2020,...
We present a generic structure (the layer structure) for decoherence effects in neutrino oscillations by combining the concept of the open quantum system and quantum field theory, which include and parameterize decoherence effects from quantum mechanical and classical uncertainties. With the help of the layer structure, we classify the former as state decoherence (SD) and the latter phase...
The Pacific Ocean Neutrino Experiment (P-ONE) is an initiative to develop a new neutrino telescope to be deployed in the Northern Pacific Ocean, off the shore of British Columbia. This neutrino telescope will allow us to search for astrophysical neutrino sources and gain significant insights into the physics of the cosmos. A pathfinder mission was deployed in 2018 to study the optical...
The MicroBooNE detector, located in the Booster Neutrino Beamline (BNB) at Fermilab, has been operating since 2015. MicroBooNE's Liquid Argon Time Projection Chamber is accompanied by a Photon Detection System (consisting of 32 PMTs) used to measure the argon scintillation light and determine the timing of the neutrino interactions. This work demonstrates the analysis techniques developed to...
ZICOS is a future experiment for 0$\nu \beta \beta$ of $^{96}$Zr nuclei. In order to achieve sensitivity over $10^{27}$ years, ZICOS will use tons of $^{96}$Zr, and need to remove $^{208}$Tl backgrounds as observed by KamLAND-Zen one order of magnitude. For this purpose, we have developed new technique to distinguish the signal and background using topology of Cherenkov light. We have measured...
Abstract
Nowadays the standard way to describe neutrino oscillations is the quantum-mechanical approach in terms of plane waves, because the current description of the phenomenon within quantum field theory with the help of localized wave packets is very bulky [1]. However, there was an earlier attempt to describe neutrino oscillations within the standard Feynman diagram technique [2]. We...
The detector of Jiangmen Underground Neutrino Observatory (JUNO) is the largest underground liquid scintillator detector in the world, and it is expected to start data-taking in 2023. The JUNO detector mainly consists of a 20 kton liquid scintillator and a large number of photomultiplier tubes. It will work as a multi-purpose detector, aiming to determine the neutrino mass ordering as its...
In this work we study the potential of the future experiments INO, JUNO and T2HK to determine the neutrino mass ordering. When these three experiments are combined, one can achieve mass ordering sensitivity at a significant confidence level irrespective of the energy resolution of JUNO or the value of $\delta_{\rm CP}$. The main synergy between the reactor experiment and the...
A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. Apart from the increase in statistics and the lifting of degeneracies providing improved constraints on oscillation parameters, the systematics in T2K and SK’s analyses share many common features and have been carefully studied for the joint...
The KATRIN experiment aims at the direct measurement of the electron neutrino mass with $\,0.2\,$eV/c² sensitivity. The high luminosity windowless gaseous molecular tritium source together with the magnetic adiabatic collimation of the electrostatic (MAC-E) filter technique allows for precision endpoint spectroscopy of the tritium beta decay. The analyses of the first and second tritium...
The Hyper-Kamiokande experiment (HK) is a complex of an intense neutrino beam facility, J-PARC, and a large water Cherenkov detector, HK. It covers wide physics goals, for instance, precise measurements of neutrino oscillation, proton-decay search, and supernovae neutrino detection. The neutrino detector HK will be equipped with 20,000 PMT of 50 cm diameter, whose timing resolution is 1 ns and...
We show that the crucial measurement of the CP violation phase ($\delta_{\mathrm{CP}}$), planned to be performed at the DUNE experiment, can be spoiled if we assume the decoherence phenomena in nature, with sizeable effects. Considering this framework, we find that the $\sin^2{\theta_{13}}$ and $\delta_{\mathrm{CP}}$ can be distorted from the current best-fit values. The discrepancies for...
Lorentz violation (LV) and non-standard interactions (NSI) are two of the most popular scenarios beyond the Standard Model (BSM) of particle physics. Both of these BSM physics can affect neutrino oscillation significantly. However, their effects can mimic each other, and it would be difficult to distinguish between them at a long-baseline experiment. Here, we show how the atmospheric...
Exposing kt-scale water-based liquid scintillator (WbLS) optical detectors to GeV-level neutrino beams provides a unique opportunity to make both a world-leading long-baseline high-energy neutrino oscillation measurement and numerous unprecedented low-energy physics measurements. For long-baseline neutrino oscillation measurements, WbLS detectors such as Theia, have comparable performance to...
The standard three-neutrino oscillation framework seems to be rather established; however, the percentage level of the precision on the mixing parameters still leaves room for effects not described by the standard physics. Future long baseline (LBL) accelerator experiments will play an important role in the search for new physics effects in neutrino oscillations. Indeed, such experiments will...
The unified approach of Feldman and Cousins allows for estimating confidence intervals for datasets with small statistics that commonly arise in high energy physics. It has gained widespread use, for instance, in measurements of neutrino oscillation parameters in long-baseline experiments. However, the approach is computationally intensive as it is typically done in a grid-based fashion over...
Coherent elastic neutrino-nucleus scattering (CEνNS) is a new tool for examining the Standard Model and searching neutrino electromagnetic properties, which can be a manifestation of new physics [1]. We study the electromagnetic contribution to elastic neutrino-nucleon and neutrino-nucleus scattering processes. Following our approach developed for the case of elastic neutrino-electron [2] and...
The NUCLEUS experiment aims for the first fully coherent detection of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) at a new experimental site between the two 4 GWth reactor cores of the Chooz power plant. The signature of a CE$\nu$NS event will be a nuclear recoil at the 20 eV-scale inside a CaWO4 target crystal. At this energy scale, a reliable simulation of...
The Project 8 experiment is a next generation neutrino mass experiment that aims to measure the absolute neutrino mass with a sensitivity of 40 meV by measuring the electron energy spectrum close to the tritium beta endpoint. To overcome statistical and systematic limitations of current direct neutrino mass experiments, Project 8 uses the new detection method of cyclotron radiation emission...
The nuclear matrix element of neutrinoless double-β decay is an essential input for determining the neutrino effective mass, if the half-life of this decay is measured. Reliable calculation of this nuclear matrix element has been a long-standing problem because of the diversity of the predicted values of the nuclear matrix element, which depends on the calculation method. In this study, we...
Primordial black holes (PBHs) with initial mass ~10^15 g are currently breathing their last breaths due to Hawking radiation. As transient burst events, their deaths are expected to produce copious amounts of neutrinos, both directly and indirectly from the decay of other emitted particle species. If such a PBH burst occurs in the local neighborhood, they can produce a detectable signal in our...
We present a phenomenological study of MicroBooNE’s ability to investigate $e^+e^-$ final states produced in dark photon mediated neutrino-upscattering—a beyond-Standard Model process proposed as a solution to the MiniBooNE anomaly. Utilising the similarities shared between the observable signatures of neutrino-induced $e^+e^-$ and single photons originating in the radiative decays of the...
We explore the neutrino signals from proton decays catalyzed by GUT monopoles in the Sun. Three typical proton decay modes, $p \rightarrow e^+ \pi$, $p \rightarrow \mu^+ K^0$ and $p \rightarrow \bar{\nu}_e \pi^+$, have been analyzed for the Super-Kamiokande experiment. The monopole-induced neutrinos arise from interactions and subsequent decays of the proton decay products. To obtain the...
The seesaw models can naturally explain the neutrino masses and the matter-antimatter asymmetry of our universe. The seesaw scale is usually very high and one can integrate out the heavy degrees of freedom to obtain the seesaw effective field theory (SEFT). We establish the connection between the full seesaw model and the low-energy SEFT from a complete new point of view: the invariant theory....
The discovery of the phenomena of neutrino oscillations suggests that neutrinos have non-zero masses, providing solid experimental evidence for physics beyond SM (BSM). To explain the non-zero masses of neutrinos, SM needs an extension. We use the Standard Model Extension (SME) framework to analyze Lorentz Invariance Violation (LIV), wherein the LIV effects are treated as a perturbative effect...
The time profile of neutrino emissions from core-collapse supernovae contains unique information about the dynamics of the collapsing stars and the behavior of particles in dense en- vironments. The observation of neutrinos from the SN1987A supernova, in the Large Magellanic Cloud, marked the beginning of neutrino astronomy. To date, no other supernova neutrino obser- vation has been made. It...
PROSPECT-I, the first phase of the Precision Reactor Oscillation and SPECTrum Experiment, demonstrated the observation of reactor antineutrinos in an aboveground detector with good energy resolution and well-controlled backgrounds at a baseline of $\sim$7m from the High Flux Isotope Reactor (HFIR) reactor at Oak Ridge National Laboratory. The PROSPECT collaboration is now preparing an upgraded...
The goal of the SoLid experiment is to conduct a search for active-to-sterile anti-neutrino oscillation at a very short distance (6.3-8.9 m) from the core of the SCK-CEN BR2 research reactor in Mol, Belgium, and provide a unique and complementary test of the so-called Reactor Antineutrino Anomaly. A secondary objective of the experiment is to measure the pure U-235 antineutrino spectrum with a...
This poster shows the use of Zonal Harmonic Field Expansion for fast electric and magnetic field simulations with the superposition principle, and for near-realtime adiabatic electron tracking. Various measurements in the KATRIN experiment require special main spectrometer coil current and electrode potential configurations, most prominently the recent Shifted Analyzing Plane background...
The IceCube Neutrino Observatory, a gigaton ice Cherenkov detector located at the South Pole, detects a high rate of atmospheric neutrinos. The DeepCore array extends IceCube’s detection of atmospheric neutrinos down to GeV-scales, which is the range necessary to measure neutrino oscillations. With the high statistics atmospheric neutrino sample, the reconstruction of GeV-scale IceCube...
SNO+ is a phased experiment to ultimately search for neutrinoless double beta decay in a Tellurium-loaded liquid scintillator detector. From 2017 to 2019, SNO+ operated as a pure water Cherenkov detector with a very low energy threshold. The 2.2 MeV gammas, characteristic of neutron captures, were detected with an efficiency around 50%, allowing the identification of inverse beta decays...
The CONUS experiment aims at detecting coherent elastic neutrino nucleus scattering (CE$\nu$NS) at the commercial nuclear power plant in Brokdorf, Germany. A high antineutrino flux is guaranteed at a distance of 17.1m to the reactor core with a maximum thermal power of 3.9GW$_{th}$. The recoils induced by the neutrinos are detected with four low energy threshold point-contact high-purity...
The KM3NeT neutrino telescope is currently being deployed in the Mediterranean Sea. While the two sites, ORCA designed to study sub-TeV neutrinos and ARCA optimized for the TeV-PeV range, are not yet completed, the current effective area allows us to carry out the first searches for astrophysical neutrinos. In this contribution, we present the results of the search for MeV-TeV neutrinos from...
Seesaw mechanism is a popular approach to give a viable explanation to the source of non-zero neutrino mass and to the cause of matter dominance of the Universe - two of the most important open problems that could not be answered by the Standard Model (SM) of Particle Physics. A minimal extension of the SM is studied, incorporating type-I+II seesaw mechanism with only one right-handed neutrino...
Arrays with tens to hundreds of Metallic Magnetic Calorimeters (MMCs), each implanted with $^{163}$Ho, were selected for the ECHo experiment, because of the excellent energy resolution of up to 2-3 eV, a fast response time below 1 µs, and a near-linear detector response that allows for a reliable energy calibration. Based on the performance achieved with the detectors developed for the first...
In the ECHo experiment, the effective electron neutrino mass can be determined by the analysis of the endpoint region of the calorimetrically acquired $^{163}$Ho electron capture spectrum. The spectrum was acquired using arrays of tens of low temperature metallic magnetic calorimeters enclosing the source. The fraction of $^{163}$Ho events which are in the region of interest can be as small as...
Last year the Tibet ASgamma experiment reported the observation of a diffuse gamma-ray emission from the Galactic plane with energy up to the PeV. This finding seems to be confirmed by LHAASO preliminary results. Both measurements provide the first evidence of a diffuse gamma-ray emission throughout the Galaxy up to such high energies.
These results have relevant implications for neutrino...
The recent detection of the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) opens the possibility to use neutrinos to explore physics beyond standard model with small size detectors. However, the CE$\nu$NS process generates signals at the few keV level, requiring of very sensitive detecting technologies for its detection. The European Spallation Source (ESS) has been identified as an...
Recent follow-up campaign of IceCube neutrino alerts carried out by the Zwicky Transient Facility (ZTF) Collaboration has led to a transient association of a muon-track candidate (IC200530A) with the optical transient AT2019fdr. The transient has been classified as a Tidal Disruption Event by ZTF. Nevertheless, considering the photometric and spectroscopic properties of the event, a...
Neutrino emission from supernovae has played a transformative role in the development of neutrino physics and our understanding of how the stars collapse. Growing evidence has established the presence of dense circumstellar material for core-collapse supernova, and the interaction of accelerated cosmic rays in the supernova ejecta and the circumstellar material will produce high-energy...
Sterile neutrinos with keV-scale masses are popular candidates for warm dark matter. In the most straightforward case they are produced via oscillations with active neutrinos. We introduce effective self-interactions of active neutrinos and investigate the effect on the parameter space of sterile neutrino mass and mixing. Our focus is on mixing with electron neutrinos, which is subject to...
Effects of neutrino charge radius and magnetic moment constraints obtained from the astrophysical observations and reactor experiments as well as in-medium modifications of the constituents matter of neutron star (NS) on the electroweak interaction with matter in NS is investigated. Our interesting result on the neutrino mean free path and differential cross section with the neutrino form...
In the last decade, the IceCube Collaboration reported the existence of an astrophysical neutrino flux of ultra-high energy. In this extreme energy limit, the neutrino-nucleon interaction does occur in a kinematic domain inaccessible to the present terrestrial colliders. This situation is especially relevant when we consider the squared of the transferred momentum, Q², which can assume values...
We assess how the production of heavy neutral leptons (HNL) at the DUNE flux can affect the number of neutrino charged current (CC) events at the DUNE ND LArTPC. A deficit in the number of CC events at the LArTPC should be observed for HNLs with masses below the kaon mass. We estimate upper limits on the mixing parameters from the aforementioned deficit. We find that these limits are stronger...
The discovery of the phenomena of neutrino oscillations was the first firm experimental evidence of physics beyond the Standard Model (SM). To explain the neutrino masses and mixing, it requires an extension of the SM, called as beyond SM (BSM). The models describing BSM physics often comes with some additional unknown couplings of neutrinos termed as Non Standard Interactions (NSIs) [1]. The...
Neutrino oscillation experiments measure oscillation probabilities as functions of neutrino energy. The success of these experiments therefore largely depends upon their neutrino energy reconstruction accuracies. Nuclear effects and detector effects, however, can significantly affect neutrino event topologies seen by experiments in few-GeV energy region, and lead to large systematic...
In electron capture processes, an electron of the parent atom is captured by the nucleus and an electron neutrino is emitted, leaving the daughter atom in an excited state. Precise calculations of the atomic de-excitation processes can be performed for isolated atoms. In practice, radioactive decay occurs with the atom in a medium. We present the possibility to study effects the environment...
The use of spacings between ordered real-valued numbers is very useful in many areas of science. In particular, either unnaturally small or large spacings can be a signal of an interesting effect.
We introduce new statistical tests based on the observed spacings of ordered data. These statistics are sensitive to detect non-uniformity in random samples, or short-lived features in event time...
The IsoDAR neutrino source comprises a novel compact cyclotron capable of delivering 10 mA of 60 MeV protons in cw mode and a high-power neutrino production target. It has obtained preliminary approval to run at the new underground facility Yemilab in South Korea. IsoDAR will produce a very pure, isotropic $\bar{\nu}_e$ source, with peak neutrino energy around 6 MeV and endpoint around 15 MeV....
This poster presents a joint determination of the spectra of the reactor antineutrinos resulting from fissions of $^{235}U$ and $^{239}Pu$ by the Daya Bay and PROSPECT experiments. In the Daya Bay experiment, the antineutrinos were generated by six low-enriched uranium (LEU) commercial reactors with 2.9 GW thermal power each and detected by eight antineutrino detectors deployed in...
Rare event searches allow us to search for new physics at energy scales inaccessible with other means by leveraging specialized large-mass detectors. Machine learning provides a new tool to maximize the information provided by these detectors. The information is sparse, which forces these algorithms to start from the lowest level data and exploit all symmetries in the detector to produce...
The Weakly Interacting Massive Particles (WIMPs) so far remain one of the most popular candidates for dark matter. If captured gravitationally inside the core of the Sun, these WIMPs may produce high energy neutrinos as the end product in case they undergo self annihilations at the solar core. In this work, we address the detectability of such neutrinos at the proposed KM3NeT detector. Upper...
The KM3NeT/ARCA neutrino telescope will be fundamental to unveil the high-energy cosmic neutrino sources. In this contribution, we present the expectations of this detector for starburst galaxies observation, both as a diffuse signal and as point-like excess. To describe the diffuse flux, we make use of a recent theoretical model which implemented a “blending” of spectral indexes for...
Large liquid scintillator detectors, such as JUNO, present a new opportunity to study neutral current events from the low-energy end of the atmospheric neutrinos, and possible new physics signals due to light dark matter. We carefully study the possibility of detecting Large Energy Singles (LES), i.e., events with visible scintillation energy $>15$ MeV, but no other associated tags. For an...
The IceCube Neutrino Observatory is a gigaton-scale Cherenkov detector located within the South Pole glacial ice. The detector's sensitivity to neutrino signals from GeV to PeV energies allows for probes into hypothetical energy-sensitive nonstandard interactions (NSI). Using the range of matter baselines provided by Earth, IceCube has been able to constrain neutral-current NSI by searching...
In this work, we have modified a scenario, originally proposed by Grimus and Lavoura, in order to obtain maximal values for atmospheric mixing angle and $CP$ violating Dirac phase of the lepton sector. To achieve this, we have employed $CP$ and some discrete symmetries in a type II seesaw model. In order to make predictions about neutrino mass ordering and the smallness of the reactor angle,...
The extension of the standard model with new high-scale weakly coupled physics involving right-handed neutrinos in an effective field theory framework (SMNEFT) allows for a systematic study of heavy neutrinos phenomenology in current and future experiments. We exploit the outstanding angular resolution in future lepton colliders to study the sensitivity of forward-backward asymmetries to...
In a model with additional U(1) symmetry, anomaly free, the mass of the active neutrinos is generated by the inverse see saw mechanism. The muon and tau get masses at the tree level and the mass of the electron is generated by effective operators of dimension 7 by introducing a Lambda scale. Using a Monte Carlo simulation, the model parameters are adjusted according to the mass of the charged...
The IceCube low energy extension DeepCore observes GeV-scale atmospheric neutrino events that only illuminate a small fraction of its photosensors. This makes event reconstruction challenging, and this challenge is magnified by the complex neutrino event topologies and the difficulty in modeling Cherenkov photon propagation in an inhomogeneous medium. These effects inhibit the use of analytic...
One of the most popular candidate of Dark Matter (DM) particle are the Weakly Interacting Massive Particles(WIMPs). These, once gravitationally captured in massive celestial objects and annihilating between them into Standard Model particles, can be indirectly detected. The centre of those massive objects is, therefore, a place where to look for a possible neutrino excess from DM annihilations...
It is possible to increase sensitivity to low energy physics in a third or fourth DUNE-like module with careful controls over radiopurity and some modifications to a detector similar to the DUNE Far Detector design. In particular, sensitivity to supernova and solar neutrinos can be enhanced with improved MeV-scale reach. A neutrinoless double beta decay search with 136Xe loading appears...
Super-Kamiokande has observed boron-8 solar neutrino recoil electrons at kinetic energies as low as 3.49 MeV to study neutrino flavor conversion within the sun. At SK-observable energies, these conversions are dominated by the Mikheyev–Smirnov–Wolfenstein effect. An upturn in the electron survival probability in which vacuum neutrino oscillations become dominant is predicted to occur at lower...
The Jiangmen Underground Neutrino Observatory (JUNO) is a neutrino medium baseline experiment under construction in southern China, expecting to begin data taking in 2023.
The experiment has been proposed with the main goals of determining the neutrino mass ordering and measuring three oscillation parameters with sub-percent precision.
To reach these goals, JUNO is located about 53$\,$km...
We consider relatively heavy neutrinos νH, mostly contributing to a sterile state νs, with mass in the range 10 MeV ≲ms≲mπ∼135 MeV, which are thermally produced in the early universe in collisional processes involving active neutrinos, and freezing out after the QCD phase transition. If these neutrinos decay after the active neutrino decoupling, they generate extra neutrino radiation, but also...
Astrophysical neutrinos are mysterious particles of ultra-high energies with no known progenitor. Since 2011, the IceCube neutrino observatory has been detecting numerous neutrino events with energies of hundreds of TeV. However, it hasn’t been able to pinpoint source for the majority of events. The only exception is IceCube-170922A whose source is believed to be a blazar TXS 0506+056 that was...
Results of experiments like LSND and MiniBOONE suggest the presence of an eV scale sterile neutrino. We investigate the resonance matter effect in presence of sterile neutrino and present the analytical expressions of the neutrino oscillation/survival probabilities using Δ21=0 approximation. These analytical expressions help us to understand better the existing degeneracies, e.g.,...
KM3NeT/ORCA is a neutrino telescope currently under construction in
the Mediterranean Sea near Toulon, France. Its ultimate goal is the
determination of the neutrino mass ordering based on several years of
data taking with an instrumented seawater mass of about 7 Mton. From
January 2020 until November 2020 KM3NeT/ORCA accumulated data
with six detection units, which corresponds to about...
The DeepCore detector is a densely instrumented sub-array of the IceCube Neutrino Observatory designed to observe atmospheric neutrino interactions above 5 GeV via Cherenkov radiation in the Antarctic ice. At these energies, Earth-crossing muon neutrinos have a high chance of oscillating into tau neutrinos. While DeepCore is able to measure the atmospheric oscillation parameters with a...
The IceCube Neutrino Observatory detects neutrinos at energies orders of magnitude higher than those accessible to current accelerator neutrinos and probes fundamental neutrino properties at energies otherwise not accessible. Above 40 TeV, neutrinos of astrophysical and atmospheric origin traveling through the Earth will be absorbed as they interact with nuclei, changing the zenith angle...
The Spallation Neutron Source (SNS), used by the COHERENT experiment as a source of neutrinos to measure CE$\nu$NS cross section, produces $\nu_e$, $\nu_{\mu}$, and $\bar{\nu}_{\mu}$ in energy ranges of a few tens of MeV. A heavy water Cherenkov detector is under construction to measure this neutrino flux in support of CE$\nu$NS measurement. The heavy water detector can also be used to measure...
When a burst of neutrinos from a core-collapse supernova (CCSN) passes by the Earth, it causes a permanent change in the local space-time metric, called the gravitational wave (GW) memory. Long considered unobservable, this effect will be detectable in the near future, at deci-Hertz GW interferometers. I will present a novel idea, where observations of the neutrino GW memory from CCSNe will...
Many astrophysical sources can emit neutrinos in the energy below a few to several MeVs. Detecting such neutrinos will provide us with valuable information on the physical processes that govern their evolution and structure. So far, neutrinos only from the Sun and a single event of supernova (SN 1987A) have been observed. However, as the size of neutrino observatories keep increasing and the...
The observation of the neutrino burst coming from the next Galactic Core-Collapse SuperNova (CCSN) and its gravitational wave and electromagnetic counterparts will provide us invaluable information on this extreme phenomenon. KM3NeT is a neutrino telescope consisting of two detectors, ORCA and ARCA, currently under deployment in the Mediterranean Sea. By searching for an excess of coincidences...
Upcoming neutrino telescopes may soon be able to discover ultra-high-energy (UHE) cosmic
neutrinos, with energies beyond 100 PeV. Finding their sources would provide robust candidates
for the long-sought sources of ultra-high-energy cosmic-rays. We propose to do so by looking for
multiplets of UHE neutrinos in the sky. Focusing on neutrino radio-detection in IceCube-Gen2 as
a benchmark, we...
For decades, secondary scintillation in noble gases was assumed to be solely due to VUV emission from excimers, created in a three-body collision of two neutral atoms and one excited atom produced by electron impact - the so-called electroluminescence (EL) process.
Neutral Bremsstrahlung (NBrS) is non-excimer-based secondary scintillation, emitted when drifting electrons scatter on neutral...
We present how small Dirac neutrino masses can be produced by introducing many light mixing partners for the neutrino within the framework of TeV scale Quantum Gravity Theories. We give a general formula how to calculate the resulting SM flavor eigenstates in this context. This infrared way of generating neutrino masses leads to deviations in the oscillation behaviour of SM neutrinos.Then we...
Axions and axion-like particles (ALPs) are some of the most popular candidates for dark matter [1]. Axions are also considered [2] as new physics contributions to the muon g – 2 . Following the existed interest to ALPs we consider interaction between neutrinos and hypothetical axion-like particles and derive for the first time the probability of neutrino oscillations accounting for their...
We study the capability of INO-ICAL to determine the atmospheric neutrino oscillation parameters. We do not use any generator level information but instead use only the output of GEANT4 simulation of the atmospheric neutrino events in the detector. In a similar previous study, by other authors, only the momentum and direction of the longest track were used. In this study, we consider a third...
The information about the Earth's interior structure comes from seismic studies and gravitational measurements. The Preliminary Reference Earth Model (PREM) of the density of the Earth is obtained by measuring the travel time of seismic waves. Here, the density distribution inside the Earth is estimated from the model-dependent empirical relations having assumptions based on temperature,...
Astrophysical objects capable of hadronic acceleration to relativistic energies have long been believed to be sources of astrophysical neutrinos. Nevertheless, the long exposure neutrino sky map shows no significant indication of point-like sources so far. This may point to flaring objects or a large population of faint, steady sources as origins of this flux. The spatially and temporally 3σ...
The aim of this presentation is to introduce a dark extension of the SM that communicates to it through three portals: neutrino, vector and scalar mixing, by which it could be possible to explain the LEE at MiniBooNE. The model regards particularly the upscattering of HNLs (1 to N heavier Dirac or Majorana neutrinos) by the mediation of a dark photon, Z’, with masses around 10 MeV – 2 GeV,...
We discuss the contribution of right-handed neutrinos (RHNs) to the neutrinoless double beta decay within the minimal type-I seesaw model by virtue of the intrinsic seesaw relation of neutrino mass and mixing parameters, and the mass dependence of the nuclear matrix elements from different nuclear models. In the viable parameter space, we find the possibilities of both the enhancement and...
In ref.[1], we have reported the quantification of bipartite and tripartite entanglement measures in two and three neutrino systems, respectively. In the tripartite system, the correlations exhibited by neutrino oscillations are like the W-states which are legitimate physical resources for quantum information tasks. Moreover, quantum studies of neutrinos has been done on IBMQ processors in...
Reactor anti-neutrinos after being discovered for the first time by Reines and Cowan, have been observed and studied by various neutrino physics experiments for different purposes. Electron anti-neutrinos are elementary particles that are inextricably associated with nuclear fission and are produced in a nuclear reactor as a result of beta decay of fissioning isotopes. Since the amount of...