PUB - Publikationen an der Universität Bielefeld

Recent results of the BNL-CCNU-Bielefeld collaboration on the Taylor expansion of the pressure up to sixth order in the baryon, strangeness and electric charge chemical potentials are presented, with the focus on the QCD equation of state. The calculations have been performed with the Highly Improved Staggered Quark action on lattices with aspect ratio 4 and temporal extents ranging from 6 to 16, i.e. at four different values of the lattice spacing. The strange quark mass has been tuned to its physical value, and two ratios of the light to the strange mass, m l / m s = 1 / 20 and 1 / 27 have been investigated. The comparison of sixth order Taylor expansion in the chemical potentials with fourth order ones shows that the truncation errors are small at least up to baryon chemical potential of μ B / T ' 2.