QCD thermodynamics with 2+1 flavors at nonzero chemical potential

We present results for the QCD equation of state, quark densities and susceptibilities at nonzero chemical potential, using 2+1 flavor asqtad ensembles with $N_t=4$. The ensembles lie on a trajectory of constant physics for which $m_{ud}\approx 0.1m_s$. The calculation is performed using the Taylor expansion method with terms up to sixth order in $\mu \mathrm{/}T$.