Curvature of the QCD critical line with 2+1 HISQ fermions

Abstract

We present results on the curvature of the critical line of QCD with 2+1 HISQ fermions at nonzero temperature and quark density obtained by analytic continuation from imaginary chemical potentials. Monte Carlo simulations are performed by means of the MILC code, suitably modified to include a nonzero imaginary baryon chemical potential. We set the chemical potential at the same value for the three quark species and work on the line of constant physics with a light to strange mass ratio of 1/20 as determined in Ref.~\cite{Bazavov:2011nk}.

7 pages, 3 figures. Talk presented at the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23-28 June, 2014, Columbia University, New York

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• Highly Improved Staggered Quarks on the Lattice, with Applications to Charm Physics
• The phase boundary for the chiral transition in (2+1)-flavor QCD at small values of the chemical potential
• The QCD phase diagram at nonzero quark density
• Scaling studies of QCD with the dynamical HISQ action
• Complex Langevin dynamics and other approaches at finite chemical potential
• Two-flavor QCD at finite quark or isospin density
• The critical line of QCD with four degenerate quarks