Parton charge symmetry violation: Electromagnetic effects and W production asymmetries

J. T. Londergan, D. P. Murdock, and A. W. Thomas
Phys. Rev. D 73, 076004 – Published 18 April 2006

Abstract

Recent phenomenological work has examined two different ways of including charge symmetry violation in parton distribution functions. First, a global phenomenological fit to high energy data has included charge symmetry breaking terms, leading to limits on the magnitude of parton charge symmetry breaking. In a second approach, two groups have included the coupling of partons to photons in the QCD evolution equations. One possible experiment that could search for isospin violation in parton distributions is a measurement of the asymmetry in W production at a collider. In this work we include both of the postulated sources of parton charge symmetry violation. We show that, given charge symmetry violation of a magnitude consistent with existing high energy data, the expected W production asymmetries would be quite small, generally less than 1%.

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  • Received 23 March 2006

DOI:https://doi.org/10.1103/PhysRevD.73.076004

©2006 American Physical Society

Authors & Affiliations

J. T. Londergan*

  • Department of Physics and Nuclear Theory Center, Indiana University, Bloomington, Indiana 47405, USA

D. P. Murdock

  • Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA

A. W. Thomas

  • Jefferson Lab, 12000 Jefferson Ave., Newport News, Virginia 23606, USA

  • *Electronic address: tlonderg@indiana.edu
  • Electronic address: murdock@tntech.edu
  • Electronic address: awthomas@jlab.org

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Issue

Vol. 73, Iss. 7 — 1 April 2006

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