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Published July 1, 2003 | Published
Journal Article Open

Weak charge of the proton and new physics


We address the physics implications of a precise determination of the weak charge of the proton, QW(p), from a parity violating elastic electron proton scattering experiment to be performed at the Jefferson Laboratory. We present the standard model (SM) expression for QW(p) including one-loop radiative corrections, and discuss in detail the theoretical uncertainties and missing higher order QCD corrections. Owing to a fortuitous cancellation, the value of QW(p) is suppressed in the SM, making it a unique place to look for physics beyond the SM. Examples include extra neutral gauge bosons, supersymmetry, and leptoquarks. We argue that a QW(p) measurement will provide an important complement to both high energy collider experiments and other low energy electroweak measurements. The anticipated experimental precision requires the knowledge of the O(alphas) corrections to the pure electroweak box contributions. We compute these contributions for QW(p), as well as for the weak charges of heavy elements as determined from atomic parity violation.

Additional Information

© 2003 The American Physical Society (Received 27 February 2003; published 17 July 2003) We thank K. Cheung, A. Derevianko, V. Flambaum, P. Herczeg, P. Langacker, W. Marciano, S. Su, and O.P. Sushkov for helpful discussions. This work was supported by the U.S. Department of Energy contracts DE–FG02–00ER41146, DE–FG03–02ER41215, DE–FG03–00ER4112, by NSF contract PHY00–71856, by CONACYT (México) contract 42026–F, and by DGAPA–UNAM contract PAPIIT IN112902.

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