Weak charge of the proton and new physics
Por:
Erler J., Kurylov A., Ramsey-Musolf M.J.
Publicada:
1 ene 2003
Resumen:
We address the physics implications of a precise determination of the weak charge of the proton, [Formula Presented] from a parity violating elastic electron proton scattering experiment to be performed at the Jefferson Laboratory. We present the standard model (SM) expression for [Formula Presented] 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 [Formula Presented] 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 [Formula Presented] 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 [Formula Presented] corrections to the pure electroweak box contributions. We compute these contributions for [Formula Presented] as well as for the weak charges of heavy elements as determined from atomic parity violation. © 2003 The American Physical Society.
Filiaciones:
Erler J.:
Instituto de Física, Universidad Nacional Autónoma de México, 04510, Mexico
Institute for Nuclear Theory, University of Washington, Seattle, WA, 98195, United States
Kurylov A.:
Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA, 91125, United States
Ramsey-Musolf M.J.:
Institute for Nuclear Theory, University of Washington, Seattle, WA, 98195, United States
Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA, 91125, United States
Department of Physics, University of Connecticut, Storrs, CT, 06269, United States
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