6533b822fe1ef96bd127d5b9

RESEARCH PRODUCT

Soft-photon corrections to the Bethe-Heitler process in the γp→l+l−p reaction

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We report on the calculation of first-order quantum electrodynamics (QED) corrections for the $\ensuremath{\gamma}p\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}{p}^{\ensuremath{'}}$ process. An upcoming experiment at MAMI (Mainz) aims to compare the cross sections of muon- and electron-pair production in this reaction to test lepton universality. Precise knowledge of the electromagnetic radiative corrections is needed for these measurements. As a first step, we present the leading QED radiative corrections in the soft-photon approximation when accounting for the finite lepton mass. For the kinematics at MAMI, we find corrections of the percent level for muons, and of order 10% for electrons.