The Nucleon Anapole Moment and Parity-Violating ep Scattering (2000)
BibTeX
@MISC{A00thenucleon,
author = {Shi-lin Zhu A and S. J. Puglia A and B. R. Holstein C and M. J. Ramsey-musolf A},
title = {The Nucleon Anapole Moment and Parity-Violating ep Scattering},
year = {2000}
}
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Abstract
Parity-violating (PV) interactions among quarks in the nucleon induce a PV γNN coupling, or anapole moment (AM). We compute electroweak gauge-independent contributions to the AM through O(1/Λ2 χ) 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 p A, 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 p A to be large, and discuss the implications for the interpretation PV of ep scattering. The SAMPLE collaboration at MIT-Bates has recently reported a value for the strange-quark magnetic form factor measured using backward angle parity-violating (PV) electron-proton scattering [1]:
Keyphrases
nucleon anapole moment parity-violating ep electroweak gauge-independent contribution strange-quark magnetic form factor axial vector radiative correction weak quark-quark interaction pv nn coupling chiral perturbation theory resonance saturation ep scattering short-distance pv effect interpretation pv standard model theoretical uncertainty anapole moment sample collaboration angle parity-violating
