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Dispersion gamma Z-box correction to the weak charge of the proton

Nov, 2008
4 pages
Published in:
  • Phys.Rev.Lett. 102 (2009) 091806
e-Print:
DOI:
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Abstract: (arXiv)
We consider elastic scattering of electrons off a proton target. The parity violating (PV) asymmetry arises at leading order in α\alpha due to interference of γ\gamma and ZZ exchange. The radiative corrections to this leading mechanism were calculated in the literature and included in experimental analyses, except for γZ\gamma Z box and cross-box contributions. We present here a dispersion calculation of these corrections in forward kinematics. We demonstrate that at the GeV energies of current PV experiments, such corrections are not suppressed by the small vector weak charge of the electron, as occurs in the atomic PV. Our results suggest that the current theoretical uncertainty in the analysis of the QWEAK experiment might be substantially underestimated, and more accurate account of the dispersion corrections are needed in order to interprete the PV data.
  • 11.55.Fv
  • 13.60.Fz
  • 12.40.Nn
  • 12.15.Lk
  • dispersion
  • kinematics
  • electron: charge
  • p: charge
  • parity: violation
  • radiative correction
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