The QCD crossover at finite chemical potential from lattice simulations

2020/02/07 by Szabolcs Borsanyi, Zoltan Fodor, Jana N. Guenther +6 · 2 citations
Physics and Astronomy · #hep-lat

paper · pdf · doi:10.1103/physrevlett.125.052001

published as Phys. Rev. Lett. 125, 052001 (2020) · 5 pages main text + 7 pages supplementary material

arxiv created 2020/02/07 · arxiv updated 2020/08/05

Abstract

We provide the most accurate results for the QCD transition line so far. We optimize the definition of the crossover temperature T_c, allowing for its very precise determination, and extrapolate from imaginary chemical potential up to real μ_B ≈ 300 MeV. The definition of T_c adopted in this work is based on the observation that the chiral susceptibility as a function of the condensate is an almost universal curve at zero and imaganiary μ_B. We obtain the parameters κ₂=0.0153(18) and κ₄=0.00032(67) as a continuum extrapolation based on N_t=10,12 and 16 lattices with physical quark masses. We also extrapolate the peak value of the chiral susceptibility and the width of the chiral transition along the crossover line. In fact, both of these are consistent with a constant function of μ_B. We see no sign of criticality in the explored range.

Cited by

• QCD Chiral Crossover Line from Lee-Yang Edge Singularities
• Lattice-based equation of state with a critical point from constant entropy contours and its comparison to effective QCD approaches