Quantifying corrections to the hadron resonance gas with lattice QCD

Rene Bellwied, Szabolcs Borsányi, Zoltán Fodor, Jana N. Guenther, Sándor D. Katz, Paolo Parotto, Attila Pásztor, Dávid Pesznyák, Claudia Ratti, Kálmán K. Szabó

Research output: Contribution to journalConference articlepeer-review

Abstract

The hadron resonance gas (HRG) model and its extensions are often used to describe the hadronic phase of strongly interacting matter. In our work we use lattice-QCD simulations with temporal extents of Nr = 8, 10 and 12 to quantify corrections to the ideal HRG. Firstly, we determine a number of subleading fugacity expansion coefficients of the QCD free energy via a two-dimensional scan on the imaginary baryon number chemical potential (μB) - strangeness chemical potential (μS) plane. Using the aforementioned coefficients, we also extrapolate ratios of baryon number and strangeness fluctuations and correlations to finite chemical potentials via a truncated fugacity expansion. Our results extrapolated along the crossover line Tc(μB) at strangeness neutrality are able to reproduce trends of experimental net-proton fluctuations measured by the STAR Collaboration.

Original languageEnglish (US)
Article number186
JournalProceedings of Science
Volume396
StatePublished - Jul 8 2022
Event38th International Symposium on Lattice Field Theory, LATTICE 2021 - Virtual, Online, United States
Duration: Jul 26 2021Jul 30 2021

All Science Journal Classification (ASJC) codes

  • General

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