We determine the phase diagram of QCD on the \mu-T plane for small to moderate chemical potentials. Two transition lines are defined with two quantities, the chiral condensate and the strange quark number susceptibility. The calculations are carried out on N_t =6,8 and 10 lattices generated with a Symanzik improved gauge and stout-link improved 2+1 flavor staggered fermion action using physical quark masses. After carrying out the continuum extrapolation we find that both quantities result in a similar curvature of the transition line. Furthermore, our results indicate that in leading order the width of the transition region remains essentially the same as the chemical potential is increased.
@article{arxiv.1102.1356,
title = {The QCD phase diagram at nonzero quark density},
author = {G. Endrodi and Z. Fodor and S. D. Katz and K. K. Szabo},
journal= {arXiv preprint arXiv:1102.1356},
year = {2011}
}