Curvature of the chiral pseudo-critical line in QCD

Abstract

We determine the curvature of the pseudo-critical line of strong interactions by means of numerical simulations at imaginary chemical potentials. We consider $N_f=2+1$ stout improved staggered fermions with physical quark masses and the tree level Symanzik gauge action, and explore two different sets of lattice spacings, corresponding to temporal extensions $N_t=6$ and $N_t=8$. Both the renormalized chiral condensate and the renormalized chiral susceptibility are used to locate the transition. The determinations obtained from the two quantities are in good agreement, a preliminary continuum extrapolation yields $\kappa =0.013(2)(1)$. We also investigate the impact of a non-zero strange quark chemical potential and compare our results to previous determinations in the literature, discussing the possible sources of systematic errors affecting the various procedures.

16 pages, 12 figures, 11 tables. Published version

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Cited by in corpus (13)

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• Anomaly matching in QCD thermal phase transition
• Thermodynamics of strong-interaction matter from Lattice QCD
• NNLO HTLpt predictions for the curvature of the QCD phase transition line
• Heavy quark scattering and quenching in a QCD medium at finite temperature and chemical potential
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