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Contributions from γZ box diagrams to parity violating elastic e−p scattering

Benjamin C. Rislow and Carl E. Carlson

  • Helmholtz Institut Mainz, Johannes Gutenberg-Universität, D-55099 Mainz, Germany and Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA

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Phys. Rev. D 83, 113007 – Published 16 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.113007

Abstract

Parity-violating elastic electron-proton scattering measures Q weak for the proton, QWp. To extract QWp from data, all radiative corrections must be well-known. Recently, disagreement on the γZ-box contribution to QWp has prompted the need for further analysis of this term. Here, we support one choice of a debated factor, go beyond the previously assumed equality of electromagnetic and γZ structure functions, and find an analytic result for one of the γZ-box integrals. Our numerical evaluation of the γZ box is in agreement within errors with previous reports, albeit somewhat larger in central value, and is within the uncertainty requirements of current experiments.

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Phys. Rev. D 83, 113007– Published 16 June, 2011
  • Received 16 November 2010
Article part of CHORUS

© 2011 American Physical Society

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