Constrained gamma-Z interference corrections to parity-violating electron scattering
Abstract
We present a comprehensive analysis of gamma-Z interference corrections to the weak charge of the proton measured in parity-violating electron scattering, including a survey of existing models and a critical analysis of their uncertainties. Constraints from parton distributions in the deep-inelastic region, together with new data on parity-violating electron scattering in the resonance region, result in significantly smaller uncertainties on the corrections compared to previous estimates. At the kinematics of the Qweak experiment, we determine the gamma-Z box correction to be ReBox^V_{gamma-Z} = (5.57 +- 0.36) x 10^{-3}. The new constraints also allow precise predictions to be made for parity-violating deep-inelastic asymmetries on the deuteron.
Cite
@article{arxiv.1304.7877,
title = {Constrained gamma-Z interference corrections to parity-violating electron scattering},
author = {N. L. Hall and P. G. Blunden and W. Melnitchouk and A. W. Thomas and R. D. Young},
journal= {arXiv preprint arXiv:1304.7877},
year = {2013}
}
Comments
38 pages, 16 figures, to appear in Phys. Rev. D