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Nuclear Theory·nucl-th

Thursday·January 25, 2018

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    On higher order and anisotropic hydrodynamics for Bjorken and Gubser flows

    Chandrodoy Chattopadhyay🇮🇳 · Ulrich Heinz🇺🇸 · Subrata Pal🇮🇳 · Gojko Vujanovic🇺🇸

    We study the evolution of hydrodynamic and non-hydrodynamic moments of the distribution function using anisotropic and third-order Chapman-Enskog hydrodynamics for systems undergoing Bjorken and Gubser flows. The hydrodynamic results are compared with the exact solution of the Boltzmann equation with a collision term in relaxation time approximation. While the evolution of the hydrodynamic moments of the distribution function (i.e. of the energy momentum tensor) can be described with high accuracy by both hydrodynamic approximation schemes, their description of the evolution of the entropy of the system is much less precise. We attribute this to large contributions from non-hydrodynamic modes coupling into the entropy evolution which are not well captured by the hydrodynamic approximations. The differences between the exact solution and the hydrodynamic approximations are larger for the third-order Chapman-Enskog hydrodynamics than for anisotropic hydrodynamics, which effectively resums some of the dissipative effects from anisotropic expansion to all orders in the anisotropy, and are larger for Gubser flow than for Bjorken flow. Overall, anisotropic hydrodynamics provides the most precise macroscopic description for these highly anisotropically expanding systems.

    nucl-thPRC(2018)·43 citations
  2. 02

    Directed flow of open charm in Au+Au collisions at = 200 GeV using a quark coalescence model

    Md Nasim🇺🇸 · Subhash Singha🇺🇸

    The directed flow () of open charm meson () is studied in Au+Au collisions at = 200~GeV using A Multi-Phase Transport (AMPT) model framework with partonic interactions (string melting version). Within this framework, it is found that although the initial spatial eccentricity () of charm quark is smaller than light quarks, the charm quark magnitude is found to be approximately 7 times larger than that of the light u quark at large rapidity. This indicates that the charm quarks can retain more information from initial condition than the light quarks. We have studied the directed flow of as a function of rapidity and transverse momentum using quark coalescence as the mechanism for hadron production. Like charm quark, the magnitude is found to be about 7 times larger than that of the light () hadrons at large rapidity.

    nucl-thPRC(2018)·21 citations
  3. 03

    Removal Energies and Final State Interaction in Lepton Nucleus Scattering

    Arie Bodek🇺🇸 · Tejin Cai🇺🇸

    We investigate the binding energy parameters that should be used in modeling electron and neutrino scattering from nucleons bound in a nucleus within the framework of the impulse approximation. We discuss the relation between binding energy, missing energy, removal energy (), spectral functions and shell model energy levels and extract updated removal energy parameters from eep spectral function data. We address the difference in parameters for scattering from bound protons and neutrons. We also use inclusive e-A data to extract an empirical parameter to account for the interaction of final state nucleons (FSI) with the optical potential of the nucleus. Similarly we use to account for the Coulomb potential of the nucleus. With three parameters , and we can describe the energy of final state electrons for all available electron QE scattering data. The use of the updated parameters in neutrino Monte Carlo generators reduces the systematic uncertainty in the combined removal energy (with FSI corrections) from 20 MeV to 5 MeV.

    nucl-thhep-exhep-phEPJC(2019)·67 citations

Affiliations

first authorsco-authorsvia INSPIRE