Running quark mass in two flavor QCD

TL;DR

This paper reports initial results on the step scaling function for the pseudoscalar density renormalization factor in two-flavor QCD, using Schrödinger functional techniques and improved Wilson fermions, and evaluates a variant of the HMC algorithm.

Contribution

It provides the first computation of the step scaling function sigma_P in two-flavor QCD with improved Wilson fermions and assesses a new HMC algorithm variant.

Findings

Initial results for sigma_P in two-flavor QCD

Performance evaluation of a two pseudofermion HMC variant

Insights into renormalization group invariant quark masses

Abstract

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.