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Constrained gamma-Z interference corrections to parity-violating electron scattering

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arxiv 1304.7877 v2 pith:HNNI3ZT3 submitted 2013-04-30 nucl-th hep-phnucl-ex

Constrained gamma-Z interference corrections to parity-violating electron scattering

N. L. Hall , P. G. Blunden , W. Melnitchouk , A. W. Thomas , R. D. Young This is my paper
classification nucl-th hep-phnucl-ex
keywords gamma-zparity-violatingcorrectionselectronscatteringanalysisconstraintsdeep-inelastic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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