pQCD calculation of γZ-exchange amplitudes in elastic ep scattering demonstrates that the usual dispersion relation for the axial-vector part is invalid at high Q² and requires a once-subtracted form.
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$\gamma Z$-exchange contribution in elastic $ep$ scattering by perturbative QCD
pQCD calculation of γZ-exchange amplitudes in elastic ep scattering demonstrates that the usual dispersion relation for the axial-vector part is invalid at high Q² and requires a once-subtracted form.