QCD phase diagram for small densities from simulations at imaginary μ

We present results on the QCD phase diagram for small densities without reweighting. bur simulations are performed with an imaginary chemical potential pi for which the fermion determinant is positive. On an 8(3) x 4 lattice with 2 flavors of staggered quarks, we map out the pseudo-critical temperature T-c (mu(I)). For mu(I)/T less than or equal to pi/3, this is an analytic function whose Taylor expansion converges rapidly, with truncation errors smaller than statistical ones. The result is analytically continued to give the location of the pseudo-critical line for real mu(B) less than or similar to 500 MeV.