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We calculate $\gamma Z$ exchange corrections to the parity-violatingasymmetry of the elastic electron-proton scattering in a parton model using theformalism of generalized parton distributions(GPDs). We also examine thevalidity of the zero-momentum-transfer approximation adopted in the literaturesand find that it overestimates the $\gamma Z$ exchange effect significantly atthe forward scattering angles.

Partonic calculation of $\gamma Z$ Exchange Corrections to Parity-Violating Elastic Electron-Proton Scattering