Nucleon anapole moment and parity-violating ep scattering - art. no. 033008

Parity-violating (FV) interactions among quarks in the nucleon induce a PV gamma NN coupling, or anapole moment (AM). We compute electroweak gauge-ind ependent contributions to the AM through O(1/Lambda(chi)(2)) in chiral pert urbation theory. We estimate short-distance PV effects using resonance satu ration. The AM contributions to PV electron-proton scattering slightly enha nce the axial vector radiative corrections, R-A(p),over the scale implied b y the standard model when weak quark-quark interactions are neglected. We e stimate the theoretical uncertainty associated with the AM contributions to R-A(p) to be large, and discuss the implications for the interpretation PV of ep scattering.