Gamma-Z box contributions to parity violating elastic e-p scattering
Rislow, Benjamin C. · Carlson, Carl E.
Original · EN
Parity-violating (PV) elastic electron-proton scattering measures Q-weak for the proton, QWᵖ. To extract QWᵖ from data, all radiative corrections must be well-known. Recently, disagreement on the gamma-Z box contribution to QWᵖ has prompted the need for further analysis of this term. Here, we support one choice of a debated factor, go beyond the previously assumed equality of electromagnetic and gamma-Z structure functions, and find an analytic result for one of the gamma-Z box integrals. Our numerical evaluation of the gamma-Z box is in agreement within errors with previous reports, albeit somewhat larger in central value, and is within the uncertainty requirements of current experiments.
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