We have studied QCD with nf=2+1 flavors discretized in the HISQ/tree rooted staggered fermion formulation and in the presence of an imaginary baryon chemical potential, with a physical strange quark mass and a light-to-strange mass ratio ml/ms=1/20,…
We are grateful to Philippe de Forcrand for useful discussions and correspondence. We acknowledge the use of the computer facilities at the INFN apeNEXT Computing Center in Rome and of the PC clusters of the INFN Bari Computer Center for Science.
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