New scenarios for hard-core interactions in a hadron resonance gas

Abstract

The equation of state of a baryon-symmetric hadronic matter with hard-sphere interactions is studied. It is assumed that mesons are point-like, but baryons and antibaryons have the same hard-core radius rB. Three possibilities are considered: 1) the baryon-baryon and antibaryon-baryon interactions are the same; 2) baryons do not interact with antibaryons; 3) the baryon-antibaryon and meson-(anti)baryon interactions are negligible. By choosing the parameter rB=0.3-0.6 fm, we calculate the nucleon to pion ratio as a function of temperature and perform the fit of hadron yields measured in central Pb+Pb collisions at the bombarding energy Ecm=2.76 TeV per nucleon pair. New nontrivial effects in the interacting hadron resonance gas at temperatures 150-200 MeV are found.

arXiv comment30 pages, 11 figures

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Cited by in corpus (32)

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• Freeze-out temperature from net-Kaon fluctuations at RHIC
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• Thermodynamic Geometry and Deconfinement Temperature
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• Universal descriptions of chemical freeze-out based on pressure and specific heat