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Contributions from γZ\gamma Z box diagrams to parity violating elastic epep scattering

Nov, 2010
4 pages
Published in:
  • Phys.Rev.D 83 (2011) 113007
e-Print:
DOI:
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Abstract: (arXiv)
Parity-violating (PV) elastic electron-proton scattering measures Q-weak for the proton, QWpQ_W^p. To extract QWpQ_W^p from data, all radiative corrections must be well-known. Recently, disagreement on the gamma-Z box contribution to QWpQ_W^p 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 gamma-Z structure functions, and find an analytic result for one of the gamma-Z box integrals. Our numerical evaluation of the gamma-Z box is in agreement within errors with previous reports, albeit somewhat larger in central value, and is within the uncertainty requirements of current experiments.
  • 13.40.Ks
  • 12.15.Lk
  • 13.60.Fz
  • 14.20.Dh
  • parity: violation
  • loop integral: 4
  • photon: loop integral
  • Z0: loop integral
  • electron p: elastic scattering
  • radiative correction
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