Model-dependence of the γz-dispersion correction to the proton's weak charge

Mikhail Gorchtein, C. J. Horowitz, M. J. Ramsey-Musolf

Research output: Contribution to journalConference articlepeer-review


We analyze the dispersion correction to elastic parity violating electron-proton scattering due to γZ exchange and theoretical uncertainties associated with this correction. The new Standard Model prediction for the weak charge of the proton in the kinematics of the Q-Weak experiment, QWp = (0:0767±0:0008±0:0020γZ), the latter error being dominated by the uncertainty in the isospin structure of the inclusive cross-section. To reduce this uncertainty we propose to analyze the VDM sum rule at JLab energy. Another possibility is to perform the measurement of QWp at a lower energy, and such an experiment is planned in Mainz.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2012
Externally publishedYes
Event10th Conference on Quark Confinement and the Hadron Spectrum, Confinement 2012 - Munich, Germany
Duration: 8 Oct 201212 Oct 2012


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