O(4) scaling analysis in two-flavor QCD at finite temperature and density with improved Wilson quarks
January 31, 2017
March 24, 2017
We study the curvature of the chiral transition/crossover line between the low-temperature hadronic phase and the high-temperature quark-gluon-plasma phase at low densities, performing simulations of two-flavor QCD with improved Wilson quarks.
After confirming that the chiral order parameter defined by a Ward-Takahashi identity is consistent with the scaling of the O(4) universality class at zero chemical potential, we extend the scaling analysis to finite chemical potential
to determine the curvature of the chiral transition/crossover line at low densities
assuming the O(4) universality.
To convert the curvature in lattice units to that of the $T_c(\mu_B)$ in physical units,
we evaluate the lattice scale applying a gradient flow method.
We find $\kappa=0.0006(1)$ in the chiral limit, which is much smaller than that obtained in (2+1)-flavor QCD with improved staggered quarks.
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