Nuclear Theory·nucl-th

Wednesday·April 7, 2021

12 papers—7 primary·5 cross-listed

08
Challenges in Solving Chiral Hydrodynamics
Enrico Speranza🇺🇸 · Fabio S. Bemfica🇧🇷 · Marcelo M. Disconzi🇺🇸 · Jorge Noronha🇺🇸
We prove that ideal chiral hydrodynamics, as derived from chiral kinetic theory, is acausal and its initial-value problem is ill-posed both in the linearized case around a local equilibrium solution and also in the full nonlinear regime. Therefore, such theory cannot be used to determine how the chiral anomaly affects the hydrodynamic evolution. We show that these fundamental issues can be fixed by using different definitions (frames) for the hydrodynamic fields. This leads to a causal theory of ideal chiral hydrodynamics where the vorticity strength is constrained by the coefficient that encodes the anomaly.
↳ hep-thhep-phnucl-thPRD(2023)·40 citations
09
Measurement of relative isotopic yield distribution of even-even fission fragments from $^{235}$ U( $n_{t h}$ , $f$ ) following $γ$ ray spectroscopy
Aniruddha Dey🇮🇳 · D.C. Biswas🇮🇳 · A. Chakraborty🇮🇳 · S. Mukhopadhyay🇮🇳 · A. K. Mondal🇮🇳 · L. S. Danu🇮🇳 · B. Mukherjee🇮🇳 · S. Garg🇨🇳 · B. Maheshwari🇮🇳 · A. K. Jain🇮🇳 · A. Blanc🇫🇷 · G. de France🇫🇷 and 8 other authors
A detailed investigation on the relative isotopic distributions has been carried out for the first time in case of even-even correlated fission fragments for the $^{235}$ U( $n_{t h}$ , $f$ ) fission reaction. High-statistics data were obtained in a prompt $γ$ ray spectroscopy measurement during the EXILL campaign at ILL, Grenoble, France. The extensive off-line analysis of the coincidence data have been carried out using four different coincidence methods. Combining the results from 2-dimensional $γ - γ$ and 3-dimensional $γ - γ - γ$ coincidence analysis, a comprehensive picture of the relative isotopic yield distributions of the even-even neutron-rich fission fragments has emerged. The experimentally observed results have been substantiated by the theoretical calculations based on a novel approach of isospin conservation, and a reasonable agreement has been obtained. The calculations following the semi-empirical GEF model have also been carried out. The results from the GEF model calculations are found to be in fair agreement with the experimental results.
↳ nucl-exnucl-thPRC(2021)·12 citations
10
Jet Transport Coefficient at the Large Hadron Collider Energies in a Color String Percolation Approach
Aditya Nath Mishra🇭🇺 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳
Within the color string percolation model (CSPM), jet transport coefficient, $q^$ , is calculated for various multiplicity classes in proton-proton and centrality classes in nucleus-nucleus collisions at the Large Hadron Collider energies for a better understanding of the matter formed in ultra-relativistic collisions. $q^$ is studied as a function of final state charged particle multiplicity (pseudorapiditydensity at midrapidity), initial state percolation temperature and energy density. The CSPM results are then compared with different theoretical calculations from the JET Collaboration those incorporate particle energy loss in the medium.
↳ hep-phhep-exhep-thnucl-ex+1Physics(2022)·11 citations
11
$V_{u d}$ radiative corrections with lattice input
Chien-Yeah Seng🇩🇪
We will describe several pioneering efforts in the study of electromagnetic radiative corrections to semileptonic decay processes, with particular emphasis on the role of lattice QCD. These studies are essential for the precise extraction of the matrix element $V_{u d}$ from beta decays of pion, free neutron and $J^{P} = 0^{+}$ nuclei, and are crucial to address several recently-emerged anomalies involving $V_{u d}$ and $V_{u s}$ , which may provide hints for physics beyond the Standard Model.
↳ hep-lathep-exhep-phnucl-ex+12 citations
12
Empirical determination of the energy loss of heavy quarks in nuclear collisions at RHIC and LHC energies
Somnath De🇮🇳 · Sudipan De🇮🇳 · Prashant Shukla🇮🇳
Heavy quarks produced in the heavy ion collisions loose energy while propagting in the hot partonic matter which finally fragment to heavy ( $D$ or $B$ ) mesons. The energy loss suffered by the heavy quarks is imprinted in the nuclear modification factor as a function of transverse momenta ( $p_{T}$ ) of these heavy mesons. An alternate measure of in-medium energy loss comes through the effective shift in transverse momentum spectra of hadrons recorded in nucleus-nucleus collisions when it is compared to the same in proton-proton collisions. We start by parametrizing invariant momentum yields of heavy mesons in p+p collisions. The fit function from p+p collisions and measured nuclear modification factor in heavy ion collisions are then utilised to obtain the shift in the transeverse mass $Δ m_{T}$ of heavy mesons produced at the RHIC and LHC experiments.The energy loss $Δ m_{T}$ so obtained is found to scale with the transverse mass ( $m_{T}$ ) of heavy mesons through a power law at different energies and centralities of collisions. We have also calculated using theoretical formalism, the total energy loss suffered by a charm quark in quark-gluon plasma produced in Pb~+~Pb collisions at the LHC energies. The evolution of the plasma is described by (2+1) dimensional longitudinal boost-invariant ideal hydrodynamics. It is found that the total energy loss of charm quarks scales with the transverse mass of charm quarks through a similar power law which supports our empirical analysis of energy loss.
↳ hep-phhep-exnucl-exnucl-thJ.Subatomic Part.Cosmol.(2025)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Challenges in Solving Chiral Hydrodynamics

Measurement of relative isotopic yield distribution of even-even fission fragments from 235U(nth​,f) following γ ray spectroscopy

Jet Transport Coefficient at the Large Hadron Collider Energies in a Color String Percolation Approach

Vud​ radiative corrections with lattice input

Empirical determination of the energy loss of heavy quarks in nuclear collisions at RHIC and LHC energies

Affiliations

Measurement of relative isotopic yield distribution of even-even fission fragments from $^{235}$ U( $n_{t h}$ , $f$ ) following $γ$ ray spectroscopy

$V_{u d}$ radiative corrections with lattice input