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arXiv · 1610.08753

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

L. M. Satarov·V. Vovchenko·P. Alba·M. I. Gorenstein·H. Stoecker
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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.

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L. M. Satarov, V. Vovchenko, P. Alba, M. I. Gorenstein, H. Stoecker. 2016-10-27. New scenarios for hard-core interactions in a hadron resonance gas. https://doi.org/10.1103/physrevc.95.024902

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