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Type: Journal article
Title: γZ corrections to forward-angle parity-violating ep scattering
Other Titles: Gamma Z corrections to forward-angle parity-violating ep scattering
Author: Sibirtsev, A.
Blunden, P.
Melnitchouk, W.
Thomas, A.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2010; 82(1):013011-1-013011-6
Publisher: American Physical Soc
Issue Date: 2010
ISSN: 1550-7998
Statement of
A. Sibirtsev, P. G. Blunden, W. Melnitchouk and A.W. Thomas
Abstract: We use dispersion relations to evaluate the γZ box contribution to parity-violating electron scattering in the forward limit arising from the axial-vector coupling at the electron vertex. The calculation makes full use of the critical constraints from recent JLab data on electroproduction in the resonance region as well as high-energy data from HERA. At the kinematics of the Qweak experiment, this gives a correction of 0.0047-0.0004+0.0011 to the standard model value 0.0713(8) of the proton weak charge. While the magnitude of the correction is highly significant, the uncertainty is within the anticipated experimental uncertainty of ±0.003.
Rights: ©2010 American Physical Society
DOI: 10.1103/PhysRevD.82.013011
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