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Nuclear Theory·nucl-th

Thursday·September 14, 2023

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    Correlations of Baryon and Charge Stopping in Heavy Ion Collisions

    Wendi Lv🇨🇳 · Yang Li🇨🇳 · Ziyang Li🇨🇳 · Rongrong Ma🇺🇸 · Zebo Tang🇨🇳 · Prithwish Tribedy🇺🇸 · Chun Yuen Tsang🇺🇸 · Zhangbu Xu🇺🇸 · Wangmei Zha🇨🇳

    Baryon numbers are carried by valence quarks in the standard QCD picture of the baryon structure, while some theory proposed an alternative baryon number carrier, a non-perturbative Y-shaped configuration of the gluon field, called the baryon junction in the 1970s. However, neither of the theories has been verified experimentally. It was recently suggested to search for the baryon junction by investigating the correlation of net-charge and net-baryon yields at midrapidity in heavy-ion collisions. This paper presents studies of such correlations in collisions of various heavy ions from Oxygen to Uranium with the UrQMD Monte Carlo model. The UrQMD model implements valence quark transport as the primary means of charge and baryon stopping at midrapidity. Detailed study are also carried out for isobaric + and + collisions. We found a universal trend of the charge stopping with respect to the baryon stopping, and that the charge stopping is always more than the baryon stopping. This study provides a model baseline in valence quark transport for what is expected in net-charge and net-baryon yields at midrapidity of relativistic heavy-ion collisions.

    nucl-thnucl-exCPC(2024)·12 citations
  2. 02

    Thermodynamics of the parity-doublet model: Symmetric nuclear matter and the chiral transition

    Jürgen Eser🇫🇷 · Jean-Paul Blaizot🇫🇷

    We present a detailed discussion of the thermodynamics of the parity-doublet nucleon-meson model within a mean-field theory, at finite temperature and baryon-chemical potential, with special emphasis on the chiral transition at large baryon densities and vanishing temperature. We consider isospin-symmetric matter. We systematically compare the parity-doublet model to a related singlet model obtained by disregarding the chiral partner of the nucleon. After studying the ground state properties of nuclear matter, the nuclear liquid-gas transition, and the density modifications of the nucleon sigma term which govern the low-density regime, we give new insight into the underlying mechanisms of the zero-temperature chiral transition occurring at several times the nuclear saturation density. We show that the chiral transition is driven by a kind of symmetry energy that tends to equilibrate the populations of opposite parity baryons. This symmetry energy dictates the composition of matter at large baryon densities, once the phase space for the appearance of the negative-parity partner is opened. We furthermore highlight the characteristic role, within the thermodynamics, of the chiral-invariant mass of the parity-doublet model. We include the chiral limit into all of our discussions in order to provide a complete picture of the chiral transition.

    nucl-thhep-phPRC(2024)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE