Speaker
Description
The possibility that the up quark mass is generated entirely through nonperturbative dynamics offers an elegant solution to the strong CP problem. In this talk, I will present a controlled calculation of the dynamically generated up quark mass in a class of QCD-like theories, based on supersymmetric QCD deformed by anomaly mediated supersymmetry breaking (AMSB). By matching the low-energy chiral Lagrangian of these models to standard QCD chiral perturbation theory at next-to-leading order, we identify the contributions responsible for additive quark mass renormalization. Remarkably, we find that for three flavors and three colors ($F = N = 3$), the dynamical up-quark mass can be of order one in units of the strange quark mass, potentially accounting for the full observed mass. I will discuss the parameter dependence of this effect, its behavior at large N, and the implications for the strong CP problem.
