Nuclear symmetry energy with strangeness in heavy-ion collisions

Hyun Kyu Lee and Mannque Rho
Phys. Rev. C 90, 045201 – Published 1 October 2014

Abstract

The role of antikaons in the symmetry energy to be determined in heavy-ion collisions as, for instance, in such observables as the π/π+ ratio is discussed using a simple chiral Lagrangian. It is shown, with some mild assumptions, that kaons, when present in the system, can affect the equation of state appreciably for both symmetric and asymmetric nuclear matter. For nuclear matter with small asymmetry, with which heavy-ion collisions are studied, it may be difficult to distinguish a stiff symmetry energy and the supersoft symmetry energy, even with kaons present. However, the effect of kaon is found to be significant such that μnμp0 near x=1/2, at which the chemical potential difference is 0 without kaon amplitude. We present arguments that, in order to make a more reliable calculation relevant for heavy-ion collisions, a much deeper understanding of how the strangeness degrees of freedom such as kaons, hyperons, etc., figure in dense baryonic matter than is presently available in the literature is needed.

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  • Received 30 June 2014

DOI:https://doi.org/10.1103/PhysRevC.90.045201

©2014 American Physical Society

Authors & Affiliations

Hyun Kyu Lee1,* and Mannque Rho2

  • 1Department of Physics, Hanyang University, Seoul 133-791, Korea
  • 2Institut de Physique Théorique, CEA Saclay, 91191 Gif-sur-Yvette, France

  • *hyunkyu@hanyang.ac.kr

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Issue

Vol. 90, Iss. 4 — October 2014

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