Non-perturbative renormalization of vector and axial vector currents in quenched QCD for a renormalization group improved gauge action

Abstract

Renormalization constants of vector ($Z_V$) and axial-vector ($Z_A$) currents are determined non-perturbatively in quenched QCD for an RG-improved gauge action and a tadpole-improved clover quark action using the Schrödinger functional method. Meson decay constants $f_{\ddot{I}}$ and $f_{\ddot{I}}€$ show much better scaling when $Z_V$ and $Z_A$ estimated for infinite physical volume are used instead of $Z$-factors from tadpole-improved one-loop perturbation theory.

Lattice2003(improve), 3 pages