Three flavor QCD at high temperatures

We have continued our study of the phase diagram of high temperature QCD with three flavors of improved staggered quarks. We are performing simulations with three degenerate quarks with masses less than or equal to the strange quark mass ms and with degenerate up and down quarks with masses mu,d less than the strange quark mass. For the quark masses studied to date, we find a crossover that strengthens as mu,d decreases, rather than a bona fide phase transition. We present new results for the crossover temperature extrapolated to the physical value of mu,d, and for quark number susceptibilities.