High-statistics lattice QCD data up to tenth order, analyzed with a Roberge-Weiss-symmetric rational ansatz, place an 84% upper bound of 103 MeV on the QCD critical endpoint temperature.
Hadron Resonance Gas with Repulsive Interactions and Fluctuations of Conserved Charges
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abstract
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.
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High-precision baryon number cumulants from lattice QCD in a finite box: cumulant ratios, Lee-Yang zeros and critical endpoint predictions
High-statistics lattice QCD data up to tenth order, analyzed with a Roberge-Weiss-symmetric rational ansatz, place an 84% upper bound of 103 MeV on the QCD critical endpoint temperature.