Quark mass renormalization with non-exceptional momenta

Abstract

Renormalization conditions imposed on quark bilinear vertex functions in the conventional RI/MOM scheme use exceptional momentum configurations. With practical values for the lattice cutoff, these vertex functions are contaminated with unwanted low energy physics (pion pole, zero modes, etc), which is a large source of systematic error. These effects can be reduced by using non-exceptional momenta. We discuss the quark mass renormalization with non-exceptional momenta using 2+1 flavor domain wall fermions based on a recently proposed RI/SMOM scheme.

Comments: 7 pages, 3 figures, Talk given at 26th International Symposium on Lattice Field Theory (Lattice 2008), Williamsburg, Virginia, 14-20 Jul 2008