Gamma-Z box contributions to parity violating elastic e-p scattering

Abstract

Parity-violating (PV) elastic electron-proton scattering measures Q-weak for the proton, $Q_W^p$. To extract $Q_W^p$ from data, all radiative corrections must be well-known. Recently, disagreement on the gamma-Z box contribution to $Q_W^p$ 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.

4 pages, 4 figures, v2: reference added, typo fixed

References in corpus (18)

• Parton distributions for the LHC
• New parton distributions for collider physics
• A Precise Determination of Electroweak Parameters in Neutrino-Nucleon Scattering
• Weak mixing angle at low energies
• Structure functions and low x physics
• Empirical Fit to Precision Inclusive Electron-Proton Cross Sections in the Resonance Region
• The Weak Charge of the Proton and New Physics
• Isovector EMC effect explains the NuTeV anomaly
• Reassessment of the NuTeV determination of the Weinberg angle
• A Kinematically Complete Measurement of the Proton Structure Function F2 in the Resonance Region and Evaluation of Its Moments
• Dispersion $\gamma Z$-box correction to the weak charge of the proton
• gamma-Z corrections to forward-angle parity-violating e-p scattering
• Photoproduction of of l=1 Baryons: Quark Model versus Large N_c
• The Two-Photon-Exchange and γZ-Exchange Corrections to parity-Violating Elastic Electron-Proton Scattering
• Detailed analysis of two-boson exchange in parity-violating e-p scattering
• Effect of two-boson exchange on parity-violating e-p scattering
• On the two-boson exchange corrections to parity-violating elastic electron-proton scattering
• Dispersion corrections to parity violating electron scattering

Cited by in corpus (29)

• QCD and strongly coupled gauge theories: challenges and perspectives
• Reduced hadronic uncertainty in the determination of $V_{ud}$
• Review of two-photon exchange in electron scattering
• Dispersive Evaluation of the Inner Radiative Correction in Neutron and Nuclear $\beta$-decay
• First Determination of the Weak Charge of the Proton
• Low Energy Measurements of the Weak Mixing Angle
• The Weak Neutral Current
• New Precision Limit on the Strange Vector Form Factors of the Proton
• A dispersive approach to two-photon exchange in elastic electron-proton scattering
• New formulation of gamma-Z box corrections to the weak charge of the proton
• The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer
• Constrained gamma-Z interference corrections to parity-violating electron scattering
• Gamma-Z box corrections to weak charges of heavy nuclei in atomic parity violation
• Dispersive estimate of the electromagnetic charge symmetry violation in the octet baryon masses
• Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region
• Beam normal spin asymmetry for the $ep\to e\Delta (1232)$ process
• Quark-hadron duality constraints on γZ box corrections to parity-violating elastic scattering
• Modification of electromagnetic structure functions for the $\gamma Z$-box diagram
• Target-normal single-spin asymmetry in elastic electron-nucleon scattering
• How strange is pion electroproduction?
• Study of Two-Photon Exchange via the Beam Transverse Single Spin Asymmetry in Electron-Proton Elastic Scattering at Forward Angles over a Wide Energy Range
• Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from ${}^{12}$C and ${}^{27}$Al
• Hadronic gamma-Z box corrections in M\oller scattering
• Hadronic weak charges and parity-violating forward Compton scattering
• Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering
• Reduced uncertainty of the axial $\gamma Z$-box correction to the proton's weak charge
• Resonance Region Structure Functions and Parity Violating Deep Inelastic Scattering
• Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region
• Early Results from the Qweak Experiment