The Weak Charge of the Proton and New Physics

Details The Weak Charge of the Proton and New Physics The Weak Charge of the Proton and New Physics

2003-02-17

arxiv.org/abs/hep-ph/0302149v1

Phys.Rev. D68 (2003) 016006

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages of LaTeX, 5 figures

Scientific paper

10.1103/PhysRevD.68.016006

We address the physics implications of a precision determination of the weak charge of the proton, QWP, from a parity violating elastic electron proton scattering experiment to be performed at the Jefferson Laboratory. We present the Standard Model (SM) expression for QWP 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 QWP 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 QWP 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 order alpha_s corrections to the pure electroweak box contributions. We compute these contributions for QWP, as well as for the weak charges of heavy elements as determined from atomic parity violation.

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