Fluctuations and correlations in high temperature QCD

Bellwied, R. and Borsányi, Szabolcs and Fodor, Zoltán and Katz, Sándor and Pásztor, Attila (2015) Fluctuations and correlations in high temperature QCD. PHYSICAL REVIEW D, 92 (11). ISSN 2470-0010

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Abstract

We calculate second- and fourth-order cumulants of conserved charges in a temperature range stretching from the QCD transition region towards the realm of (resummed) perturbation theory. We perform lattice simulations with staggered quarks; the continuum extrapolation is based on Nt = 10 ... 24 in the crossover-region and Nt = 8 ... 16 at higher temperatures. We find that the Hadron Resonance Gas model predictions describe the lattice data rather well in the confined phase. At high temperatures (above ∼250 MeV) we find agreement with the three-loop Hard Thermal Loop results.

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