Partonic calculation of γZ Exchange Corrections to Parity-Violating Elastic Electron-Proton Scattering

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We calculate γZ exchange corrections to the parity-violating asymmetry of the elastic electron-proton scattering in a parton model using the formalism of generalized parton distributions(GPDs). We also examine the validity of the zero-momentum-transfer approximation adopted in the literatures and find that it overestimates the γZ exchange effect significantly at the forward scattering angles.