Hadron Resonance Gas with Repulsive Interactions and Fluctuations of Conserved Charges

Understand

We discuss the role of repulsive baryon-baryon interactions in a hadron gas using relativistic virial expansion and repulsive mean field approaches.

• The fluctuations of the baryon number as well as strangeness-baryon correlations are calculated in the hadron resonance gas with repulsive interactions and compared with the recent lattice QCD results.
• In particular, we calculate the difference between the second and fourth order fluctuations and correlations of baryon number and strangeness, that have been proposed as probes of deconfinement.
• We show that for not too high temperatures these differences could be understood in terms of repulsive interactions.