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

Journal Article · Mon Jul 01 00:00:00 EDT 2013 · Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRevD.88.013011· OSTI ID:1088379

Hall, Nathan Luke ^[1]; Blunden, Peter Gwithian ^[2]; Melnitchouk, Wally ^[3]; Thomas, Anthony W. ^[1]; Young, Ross D. ^[1]

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1. Adelaide U.
2. Manitoba U.
3. JLAB

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 Re\box_{gamma-Z}^V = (5.61 +- 0.36) x 10^{-3}. The new constraints also allow precise predictions to be made for parity-violating deep-inelastic asymmetries on the deuteron.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1088379
• Report Number(s): JLAB-THY-13-1698; DOE/OR/23177-2491; arXiv:1304.7877
• Journal Information: Phys. Rev. D, Vol. 88, Issue 01
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS