Nafis Rezwan Khan Chowdhury
A5037615638- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Methane Hydrates and Related Phenomena
- Noncommutative and Quantum Gravity Theories
- Atmospheric Ozone and Climate
- Nuclear Physics and Applications
- IoT and Edge/Fog Computing
- Human-Automation Interaction and Safety
- Modular Robots and Swarm Intelligence
- Relativity and Gravitational Theory
- Distributed Sensor Networks and Detection Algorithms
- Radioactivity and Radon Measurements
- Astronomy and Astrophysical Research
- Big Data and Business Intelligence
- Environmental Monitoring and Data Management
- Quantum Mechanics and Applications
- Galaxies: Formation, Evolution, Phenomena
Instituto de Física Corpuscular
2018-2024
Universitat de València
2018-2024
Parc Científic de la Universitat de València
2020-2023
Tata Institute of Fundamental Research
2023
Centre National de la Recherche Scientifique
2019-2022
Université de Toulon
2022
University of Bologna
2020-2022
Institut de Recherche pour le Développement
2022
Universitat Politècnica de València
2021
National Centre for Nuclear Research
2021
We present the results of first combined dark matter search targeting Galactic Centre using ANTARES and IceCube neutrino telescopes. For particles with masses from 50 to 1000 GeV, sensitivities on self-annihilation cross section set by are comparable, making this mass range particularly interesting for a joint analysis. Dark through $\tau^+\tau^-$, $\mu^+\mu^-$, $b\bar{b}$ $W^+W^-$ channels is considered both Navarro-Frenk-White Burkert halo profiles. In combination 2,101.6 days data 1,007...
Neutrino detectors participate in the indirect search for fundamental constituents of dark matter (DM) form weakly interacting massive particles (WIMPs). In WIMP scenarios, candidate DM can pair-annihilate into Standard Model products, yielding considerable fluxes high-energy neutrinos. A detector like ANTARES, located Northern Hemisphere, is able to perform a competitive looking towards Galactic Centre, where high density thought accumulate. Both this directional information and spectral...
Abstract The results of three different searches for neutrino candidates, associated with the IceCube-170922A event or from direction TXS 0506+056, by ANTARES telescope, are presented. first search refers to online follow-up IceCube alert; second is based on standard time-integrated method employed Collaboration point-like sources; third uses information time-dependent analysis that reported bursting activity centered 2014 December 13, as input an analysis. and yield no events related...
Abstract The Protvino accelerator facility located in the Moscow region, Russia, is a good position to offer rich experimental research program field of neutrino physics. Of particular interest possibility direct beam from towards KM3NeT/ORCA detector, which currently under construction Mediterranean Sea 40 km offshore Toulon, France. This proposal known as P2O. Thanks its baseline 2595 km, this experiment would yield an unparalleled sensitivity matter effects Earth, allowing for...
A bstract The ANTARES neutrino telescope has an energy threshold of a few tens GeV. This allows to study the phenomenon atmospheric muon disappearance due oscillations. In similar way, constraints on 3+1 model, which foresees existence one sterile neutrino, can be inferred. Using data collected by from 2007 2016, new measurement Δ m 32 2 and θ 23 been performed — is consistent with world best-fit values model have derived.
The existence of diffuse Galactic neutrino production is expected from cosmic ray interactions with gas and radiation fields. Thus, neutrinos are a unique messenger offering the opportunity to test products up energies hundreds TeV. Here we present search for this using ten years ANTARES track shower data, as well seven IceCube data. data combined into joint likelihood emission according KRA$_\gamma$ model assuming 5 PeV per nucleon cutoff. No significant excess found. As consequence, limits...
Addressing the origin of astrophysical neutrino flux observed by IceCube is paramount importance. Gamma-Ray Bursts (GRBs) are among few sources capable achieving required energy to contribute such through p$\gamma$ interactions. In this work, ANTARES data have been used search for upward going muon neutrinos in spatial and temporal coincidence with 784 GRBs occurred from 2007 2017. For each GRB, expected has calculated framework internal shock model impact lack knowledge on majority source...
A search for astrophysical point-like neutrino sources using the data collected by ANTARES detector between January 29, 2007 and December 31, 2017 is presented. likelihood stacking method used to assess significance of an excess muon neutrinos inducing track-like events in correlation with location a list possible sources. Different sets objects are tested analysis: a) sub-sample \textit{Fermi} 3LAC catalog blazars, b) jet-obscured AGN population, c) sample soft gamma-ray selected radio...
A bstract One of the basic propositions quantum field theory is Lorentz invariance. The spontaneous breaking symmetry at a high energy scale can be studied low extensions like Standard model in model-independent way through effective (EFT). present and future Long-baseline neutrino experiments give scope to observe such Planck-suppressed physics invariance violation (LIV). proposed long baseline experiment, Protvino ORCA (dubbed “P2O”) with 2595 km, expected provide good sensitivities...
Astrophysical sources of gravitational waves, such as binary neutron star and black hole mergers or core-collapse supernovae, can drive relativistic outflows, giving rise to non-thermal high-energy emission. High-energy neutrinos are signatures outflows. The detection waves from common could help establish the connection between dynamics progenitor properties outflow. We searched for associated emission astrophysical transients with minimal assumptions using data Advanced LIGO its first...
This letter presents a combined measurement of the energy spectra atmospheric $ν_e$ and $ν_μ$ in range between $\sim$100 GeV $\sim$50 TeV with ANTARES neutrino telescope. The analysis uses 3012 days detector livetime period 2007--2017, selects 1016 neutrinos interacting (or close to) instrumented volume detector, yielding shower-like events (mainly from $ν_e+\overline ν_e$ charged current plus all neutral interactions) starting track $ν_μ+ \overline ν_μ$ interactions). contamination by muons...
A bstract Non-standard interactions of neutrinos arising in many theories beyond the Standard Model can significantly alter matter effects atmospheric neutrino propagation through Earth. In this paper, a search for deviations from prediction standard 3-flavour oscillations using data taken by ANTARES telescope is presented. Ten years collected 2007 to 2016, with reconstructed energies range ∼16 GeV 100 GeV, have been analysed. log-likelihood ratio test dimensionless coefficients ε μτ and ττ...
Abstract In this paper, we have estimated the neutrino mass ordering and CP violation sensitivity of proposed Protvino to ORCA (P2O) experiment after 6 years data-taking. Both unitary non-unitary $$3\times 3$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>×</mml:mo> </mml:mrow> </mml:math> mixing been considered in simulations. A forecast analysis deriving possible future constraints on parameters at P2O performed.
One of the main objectives ANTARES telescope is search for point-like neutrino sources. Both pointing accuracy and angular resolution detector are important in this context a reliable way to evaluate performance needed. In order measure detector, one possibility study shadow Moon, i.e. deficit atmospheric muon flux from direction Moon induced by absorption cosmic rays. Analysing data taken between 2007 2016, observed with $3.5\sigma$ statistical significance. The downward-going muons...
Monte Carlo simulations are a unique tool to check the response of detector and monitor its performance. For deep-sea neutrino telescope, variability environmental conditions that can affect behaviour data acquisition system must be considered, in addition reliable description active parts features physics events, order produce realistic set simulated events. In this paper, software tools used cosmic ray signatures telescope strategy developed represent time evolution natural environment...
Abstract An offline search for a neutrino counterpart to gravitational-wave (GW) events detected during the second observation run (O2) of Advanced-LIGO and Advanced-Virgo performed with ANTARES data is presented. In addition long tracks induced by $$\nu _\mu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>ν</mml:mi><mml:mi>μ</mml:mi></mml:msub></mml:math> ( $${\overline{\nu }}_{\mu }$$...
A search for point-like and extended sources of cosmic neutrinos using data collected by the ANTARES IceCube neutrino telescopes is presented. The set consists all track-like shower-like events pointing in direction Southern Sky included nine-year point-source analysis, combined with through-going used seven-year search. advantageous field view large size are exploited to improve sensitivity a factor $\sim$2 compared both individual analyses. In this work, scanned possible excesses spatial...
The first gamma-ray burst detections by Imaging Atmospheric Cherenkov Telescopes have been recently announced: GRB 190114C, detected MAGIC, 180720B and 190829A, observed H.E.S.S. A dedicated search for neutrinos in space time coincidence with the emission IACTs has performed using ANTARES data. covers both prompt afterglow phases, yielding no three GRBs studied. Upper limits on energetics of neutrino are inferred. resulting upper several orders magnitude above emission, they do not allow to...
The ANTARES neutrino telescope has an energy threshold of a few tens GeV. This allows to study the phenomenon atmospheric muon disappearance due oscillations. In similar way, constraints on 3+1 model, which foresees existence one sterile neutrino, can be inferred. Using data collected by from 2007 2016, new measurement $\Delta m^2_{32}$ and $\theta_{23}$ been performed - is consistent with world best-fit values model have derived.
The ANTARES detector is an undersea neutrino telescope in the Mediterranean Sea. search for point-like sources one of main goals telescope, requiring a reliable method to evaluate angular resolution and pointing accuracy. This work describes study Sun "shadow" effect with detector. shadow deficit atmospheric muon flux direction caused by absorption primary cosmic rays. analysis based on data collected between 2008 2017 telescope. observed statistical significance detection $3.7\sigma$,...
On October 1, 2019, the IceCube Collaboration detected a muon track neutrino with high probability of being astrophysical origin, IC191001A. After few hours, tidal disruption event (TDE) AT2019dsg, observed by Zwicky Transient Facility (ZTF), was indicated as most likely counterpart track. More recently, follow-up campaign alerts ZTF suggested second TDE, AT2019fdr, promising another candidate, IC200530A, on May 30, 2020. These are and third associations between sources high-energy neutrinos...
Abstract We develop a novel technique to exploit the extensive data sets provided by underwater neutrino telescopes gain information on bioluminescence in deep sea. The passive nature of gives us unique opportunity infer bioluminescent organisms without actively interfering with them. propose statistical method that allows reconstruct light emission individual organisms, as well their location and movement. A mathematical model is built describe measurement process signal generation...
In the past years, IceCube Collaboration has reported in several analyses observation of astrophysical high-energy neutrino events. Despite a compelling evidence for first identification source, TXS 0506+056, origin majority these events is still unknown. this paper, possible transient searched using detected by ANTARES telescope. The arrival time and direction 6894 track-like 160 shower-like over 2346 days livetime are examined to search coincidences with 54 events, means maximum likelihood...
We analyze 7.3 years of ANTARES high-energy neutrino and Fermi LAT {\gamma}-ray data in search cosmic + ({\nu}+{\gamma}) transient sources or source populations. Our analysis has the potential to detect either individual {\nu}+{\gamma} (durations {\delta}t < 1000~s), if they exhibit sufficient multiplicity, a statistical excess transients lower multiplicities. Treating track cascade event types separately, we establish detection thresholds by Monte Carlo scrambling data, determine our...