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 Schrodinger functional method. Meson decay constants p ϱ and f π show much better scaling when Z v and Z pA estimated for infinite physical volume are used instead of Z -factors from tadpole-improved one-loop perturbation theory.