Hard-Thermal-Loop QCD thermodynamics and quark number susceptibility

Sylvain Mogliacci; Nan Su

doi:10.1051/epjconf/20147000031

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 70, 00031 (2014)
https://doi.org/10.1051/epjconf/20147000031

Hard-Thermal-Loop QCD thermodynamics and quark number susceptibility

Sylvain Mogliacci and Nan Su^,*

Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany

Published online: 10 April 2014

Abstract

The weak-coupling expansion of the QCD pressure is known up to the order g⁶ log g. However, at experimentally relevant temperatures, the corresponding series is poorly convergent. In this proceedings, we discuss at which extent the gauge-invariant resummation scheme, Hard-Thermal-Loop perturbation theory (HTLpt), improves the apparent convergence. We first present HTLpt results for QCD thermodynamic functions up to three-loop order at vanishing chemical potential. Then, we report a preliminary HTLpt result of one-loop quark number susceptibility, probing the finite density equation of state. Our results are consistent with lattice data down to 2 − 3T_c, reinforcing the weakly-coupled quasiparticle picture in the intermediate coupling regime.

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© Owned by the authors, published by EDP Sciences, 2014

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