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Nuclear Theory·nucl-th

Friday·April 22, 2022

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    Effect of various particlization scenarios on anisotropic flow and particle production using UrQMD hybrid model

    Sumit Kumar Kundu🇮🇳 · Yoshini Bailung🇮🇳 · Sudhir Pandurang Rode🇷🇺 · Partha Pratim Bhaduri🇮🇳 · Ankhi Roy🇮🇳

    We discuss the effect of various particlization scenarios available in the hybrid ultrarelativistic quantum molecular dynamics (UrQMD) event generator on different observables in non-central ( 5--9 ) Au + Au collisions in the beam energy range 1A-158A GeV. Particlization models switch fluid dynamic description to the transport description using various hypersurface criteria. In addition to particlization models, various equations-of-state (EoS) provided by the UrQMD hybrid model were employed. The observables examined in this paper include the excitation function of anisotropic coefficients such as directed () and elliptic flow (), particle ratios of the species, and the shape of net-proton rapidity spectra at mid-rapidity. The results obtained here can help predict and compare the measurements provided by future experiments at the Facility for Antiproton and Ion Research (FAIR) and the Nuclotron-based Ion Collider fAcility (NICA) once the data becomes available. We also study the most suitable combination of the particlization model and EoS, which best describes the experimental measurements.

    nucl-thhep-phNPA(2023)·1 citation
  2. 02

    The Self-energy of Nucleon for the Pion-nucleon Scattering Parameter

    Susumu Kinpara🇯🇵

    The scattering amplitude of the pion-nucleon elastic scattering is calculated by the lowest-order approximation of the perturbative expansion with the non-perturbative term. The self-energy of nucleon is determined so as to give the scattering parameters of the -wave. It is shown that the scattering process mediated by the -meson plays a decisive role together with the pseudovector pion interaction.

    nucl-th2 citations
  3. 03

    Time-like Gravitational Formfactors and Shear Viscosity

    Oleg Teryaev🇷🇺

    The gravitational formfactor similar to shear viscosity is identified. In the time-like region it corresponds to the contribution of exotic hybrid meson. The exotic quantum numbers may be considered as a counterpart of dissipation in crossed channel. The ratio of viscosity to entropy density is estimated. The smallness due to holographic bound corresponds to the relative smallness of coupling of hybrid meson and the intrinsic transverse momentum, being the dynamical counterpart of temperature.

    ↳ hep-phgr-qcnucl-thJPS Conf.Proc.(2022)·5 citations
  4. 04

    Medium modification of the nucleon mechanical properties: Abel tomography case

    June-Young Kim🇩🇪 · Ulugbek Yakhshiev🇰🇷 · Hyun-Chul Kim🇰🇷

    We investigate how the gravitational form factors of the nucleon undergo changes in nuclear matter, emphasizing the Abel transformation from the three-dimensional (3D) Breit frame to the two-dimensional (2D) light-front frame. Since the gravitational form factors reveal the mechanical structure of the nucleon, we examine also the medium modifications of the energy-momentum, pressure, and shear-force distributions. We scrutinize the stabilities of the nucleon in nuclear matter. For this purpose, we employ the in-medium modified SU(2) Skyrme model to study these mechanical quantities of the nucleon, since it provides a simple but clear framework. In this in-medium modified SU(2) Skyrme model, the modification of pionic properties is performed by using low-energy pion-nucleus scattering data and the saturation properties of nuclear matter near the normal nuclear matter density, . The results reveal how the nucleon swells in nuclear matter as the mass distribution of the nucleon is broadened in medium. We also show that the mean square radii corresponding to the mass and angular momentum distributions increase in nuclear medium. This feature is kept both in 3D and 2D cases. We visualize how the strong force fields inside the nucleon in the 2D plane are distributed and illustrate how these forces undergo change in nuclear matter.

    ↳ hep-phhep-exnucl-exnucl-thEPJC(2022)·8 citations
  5. 05

    Multicomponent second-order dissipative relativistic hydrodynamics with binary reactive collisions

    Jin Hu🇨🇳 · Shuzhe Shi🇺🇸

    We derive the multi-component second-order dissipative relativistic hydrodynamic equations using the moment-expansion method. By computing the transport coefficients using hard-sphere interactions, we investigate the role of multiple components and the reactive collisions. We find that both of these factors increase the effective cross-section and hence decrease the transport coefficients and relaxation times. We further compute such transport properties using leading-order perturbative QCD cross-sections. For both types of cross-sections, we find that the ratio between vector current relaxation time and conductivity for a multi-component fluid is notably different from that for a single-component fluid. Therefore, the current study provides a more applicable guideline for such a ratio in phenomenological hydrodynamics simulations.

    ↳ hep-phnucl-thPRD(2022)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE