arXiv subjects

Maitreyee Mukherjee

Publications and source records attributed to Maitreyee Mukherjee.

4 recordsLinked to original sources

arXiv2024

Sensitivity Study of Supernova Neutrinos for Mass Hierarchy

Supernovae represent some of the most energetically explosive events in the universe, with a substantial fraction of their released gravitational energy carried away by neutrinos. This study evaluates the sensitivity of three next-generation neutrino detectors which are Deep Underground Neutrino Experiment (DUNE), Hyper-Kamiokande (Hyper-K), and the Jiangmen Underground Neutrino Observatory (JUNO) to supernova neutrinos, specifically focusing on their ability to discern between normal and inverted mass hierarchies. We utilize three different flux models: Bollig, Tamborra and Nakazato, employing the SNEWPY software to simulate the expected neutrino fluxes from core-collapse supernovae. These models highlight the variability in the predictions due to different progenitors and simulation methods. By analyzing the event rates across various interaction channels and implementing the adiabatic Mikheyev-Smirnov-Wolfenstein (MSW) effect on the neutrino flux, we have calculated the expected detection rates for each detector. Our results indicate that sensitivities range from ${\sim}3\sigma$ to ${\sim}9\sigma$ for DUNE, ${\sim}4\sigma$ to ${\sim}16\sigma$ for Hyper-K and ${\sim}1.7\sigma$ to ${\sim}6.7\sigma$ for JUNO depending on distance and flux model, with sensitivity diminishing significantly at larger distances. This work underscores the potential of future neutrino observatories to enhance our understanding of fundamental physics through the study of supernova neutrinos.

hep-ph↗

arXiv2018

Isothermal compressibility of hadronic matter formed in relativistic nuclear collisions

We present the first estimates of isothermal compressibility (\kT) of hadronic matter formed in relativistic nuclear collisions ($\sqrt{s_{\rm NN}} = 7.7$ GeV to 2.76~TeV) using experimentally observed quantities. \kT~is related to the fluctuation in particle multiplicity, temperature, and volume of the system formed in the collisions. Multiplicity fluctuations are obtained from the event-by-event distributions of charged particle multiplicities in narrow centrality bins. The dynamical components of the fluctuations are extracted by removing the contributions to the fluctuations from the number of participating nucleons. From the available experimental data, a constant value of \kT~has been observed as a function of collision energy. The results are compared with calculations from UrQMD, AMPT, and EPOS event generators, and estimations of \kT~are made for Pb-Pb collisions at the CERN Large Hadron Collider. A hadron resonance gas (HRG) model has been used to calculate \kT~as a function of collision energy. Our results show a decrease in \kT~at low collision energies to \sNN~$\sim$~20~GeV, beyond which the \kT~values remain almost constant.

nucl-ex↗

arXiv2016

Fluctuations in Charged Particle Multiplicities in Relativistic Heavy-Ion Collisions

Multiplicity distributions of charged particles and their event-by-event fluctuations have been compiled for relativistic heavy-ion collisions from the available experimental data at Brookhaven National Laboratory and CERN and also by the use of an event generator. Multiplicity fluctuations are sensitive to QCD phase transition and to the presence of critical point in the QCD phase diagram. In addition, multiplicity fluctuations provide baselines for other event-by-event measurements. Multiplicity fluctuation expressed in terms of the scaled variance of the multiplicity distribution is an intensive quantity, but is sensitive to the volume fluctuation of the system. The importance of the choice of narrow centrality bins and the corrections of centrality bin width effect for controlling volume fluctuations have been discussed. It is observed that the mean and width of the multiplicity distributions monotonically increase as a function of increasing centrality at all collision energies, whereas the multiplicity fluctuations show minimal variations with centrality. The beam energy dependence shows that the multiplicity fluctuations have a slow rise at lower collision energies and remain constant at higher energies.

nucl-ex↗

arXiv2016

Event-by-event multiplicity fluctuations in Pb-Pb collisions in ALICE

Fluctuations of various observables in heavy-ion collisions at ultra-relativistic energies have been extensively studied as they provide important signals regarding the formation of a Quark-Gluon Plasma (QGP). Because of the large number of produced particles in each event, a detailed study of event-by-event multiplicity fluctuations has been proposed as one of the signatures of the phase transition. In addition, the understanding of multiplicity fluctuations is essential for other event-by-event measurements. In the present work, we have calculated the scaled variance ($ω_{\rm ch}=σ^{\rm 2} / μ$) of the charged-particle multiplicity distributions as a function of centrality in Pb-Pb collisions at LHC energies. Here, $μ$ and $σ$ denote the mean and the width of the multiplicity distributions, respectively. The trend of scaled variances as a function of centrality is presented and discussed. Volume fluctuations play an important role while measuring the multiplicity fluctuations, which are also discussed. The results are expected to provide vital input to theoretical model calculations.

hep-ex↗