Quark-hadron duality constraints on \gamma Z box corrections to parity-violating elastic scattering
| Autor: | Hall, N. L., Blunden, P. G., Melnitchouk, W., Thomas, A. W., Young, R. D. |
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| Rok vydání: | 2015 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2015.11.081 |
| Popis: | 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 Q^2 \approx 1 GeV^2. Assuming that a similar behavior also holds for the \gamma Z proton structure functions, we find that duality constrains the \gamma Z box correction to the proton's weak charge to be \Re e\, \square_{\gamma Z}^V = (5.4 \pm 0.4) \times 10^{-3} at the kinematics of the Q_{\text{weak}} experiment. Within the same model we also provide estimates of the \gamma Z corrections for future parity-violating experiments, such as MOLLER at Jefferson Lab and MESA at Mainz. Comment: 10 pages, 3 figures. Final version to be published in Phys. Lett. B |
| Databáze: | arXiv |
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