The QCD phase diagram from analytic continuation

Bellwied, R.; Szabo, Kalman; Katz, S. D.; Borsanyi, S.; Fodor, Z.; Ratti, C.; Günther, J.

doi:10.1016/j.physletb.2015.11.011

Journal Article

FZJ-2016-00864

The QCD phase diagram from analytic continuation

Bellwied, R. ; Borsanyi, S. ; Fodor, Z. ; Günther, J. ; Katz, S. D. (Corresponding author) ; Ratti, C. ; Szabo, K.FZJ*

2015
North-Holland Publ. Amsterdam

Physics letters / B 751, 559 (2015) [10.1016/j.physletb.2015.11.011]

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Please use a persistent id in citations: http://hdl.handle.net/2128/9742 doi:10.1016/j.physletb.2015.11.011

Abstract: We present the crossover line between the quark gluon plasma and the hadron gas phases for small real chemical potentials. First we determine the effect of imaginary values of the chemical potential on the transition temperature using lattice QCD simulations. Then we use various formulas to perform an analytic continuation to real values of the baryo-chemical potential. Our data set maintains strangeness neutrality to match the conditions of heavy ion physics. The systematic errors are under control up to μB≈300 MeVμB≈300 MeV. For the curvature of the transition line we find that there is an approximate agreement between values from three different observables: the chiral susceptibility, chiral condensate and strange quark susceptibility. The continuum extrapolation is based on Nt=10Nt=10, 12 and 16 lattices. By combining the analysis for these three observables we find, for the curvature, the value κ=0.0149±0.0021κ=0.0149±0.0021.

Keyword(s): potential: chemical ; susceptibility: chiral ; quantum chromodynamics: critical phenomena ; temperature: transition ; quark: susceptibility ; condensation: chiral ; quark gluon: plasma ; hadron: gas ; curvature ; lattice field theory ; strangeness ; heavy ion ; lattice ; numerical calculations ; quark: staggered ; quark: flavor: 4 ; continuum limit ; finite temperature