Non-perturbative renormalization of the axial current with improved Wilson quarks

We. present a new normalization condition for the axial current, which is derived from the PCAC relation with non-vanishing mass. Using this condition reduces the 0(r(0)m) corrections to the axial current normalization constant Z(A) for an easier chiral extrapolation in the cases, where simulations at zero quark-mass are not possible. The method described here also serves as a preparation for a determination Of Z(A) in the full two-flavor theory.