Quark–hadron duality constraints on γZ box corrections to parity-violating elastic scattering

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2015.11.081· OSTI ID:1229695

Hall, N. L.; Blunden, P. G.; Melnitchouk, W.; Thomas, A. W.; Young, R. D.

We examine the interference \gamma Z box corrections to parity-violating elastic electron--proton scattering in the light of the recent observation of quark-hadron duality in parity-violating deep-inelastic scattering from the deuteron, and the approximate isospin independence of duality in the electromagnetic nucleon structure functions down to Q² \approx 1 GeV². Assuming that a similar behavior also holds for the \gamma Z proton structure functions, we find that duality constrains the γ Z box correction to the proton's weak charge to be Re ^V _{γ Z} ^V = (5.4 \pm 0.4) \times 10^-3 at the kinematics of the Q_weak experiment. Within the same model we also provide estimates of the γ Z corrections for future parity-violating experiments, such as MOLLER at Jefferson Lab and MESA at Mainz.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: AC05-06OR23177
• OSTI ID: 1229695
• Alternate ID(s): OSTI ID: 1227936; OSTI ID: 1229859
• Report Number(s): JLAB-THY-15-2029; DOE/OR/23177-3334; arXiv:1504.03973; S037026931500951X; PII: S037026931500951X
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 753 Journal Issue: C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
parity violation
proton weak charge
quark-hadron duality