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arXiv · 1410.5758

Curvature of the chiral pseudo-critical line in QCD

Claudio Bonati·Massimo D'Elia·Marco Mariti·Michele Mesiti·Francesco Negro·Francesco Sanfilippo
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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 $κ= 0.013(2)(1)$. 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.

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Claudio Bonati, Massimo D'Elia, Marco Mariti, Michele Mesiti, Francesco Negro, Francesco Sanfilippo. 2015-02-21. Curvature of the chiral pseudo-critical line in QCD. https://doi.org/10.1103/physrevd.90.114025

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