The Nucleon Anapole Moment and Parity-Violating ep Scattering

Abstract

Parity-violating (PV) interactions among quarks in the nucleon induce a PV $\gamma NN$ coupling, or anapole moment (AM). We compute electroweak gauge-independent contributions to the AM through ${\cal O}(1/\lamchis)$ in chiral perturbation theory. We estimate short-distance PV effects using resonance saturation. The AM contributions to PV electron-proton scattering slightly enhance the axial vector radiative corrections, R_A^p, over the scale implied by the Standard Model when weak quark-quark interactions are neglected. We estimate 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.

RevTex 29 pages + 8 PS figures, references and discussions added, to appear in Phys. Rev. D

References in corpus (1)

• Parity Violation in Elastic Electron-Proton Scattering and the Proton's Strange Magnetic Form Factor

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