Quark masses and strong CP violation

Abstract

Two flavor QCD involves three independent mass parameters for which non-perturbative effects are not universal. This precludes matching lattice and perturbative results for non-degenerate quarks and eliminates a vanishing up quark mass as a viable solution to the strong CP problem.

Comments: 1 page, 1 figure; poster contribution to the conference "Quark confinement and the hadron spectrum IX," August 30 - September 10, 2010