Running quark mass in two flavor QCD
  We present first results for the step scaling function sigma_P of the renormalization factor Z_P of the pseudoscalar density. The simulations are performed within the framework of the Schroedinger functional with two flavors of O(a) improved Wilson fermions. The knowledge of sigma_P is required to compute the renormalization group invariant quark masses. We also study the performance of a variant of the HMC algorithm using two pseudofermion fields. 
F. Knechtli, M. Della Morte, J. Rolf, R. Sommer, I. Wetzorke and U.   Wolff (ALPHA collaboration)