Leading order corrections to the Bethe-Heitler process in the $\gamma p\to l^{+}{l}^{-}p$ reaction

Matthias Heller, Oleksandr Tomalak, Marc Vanderhaeghen +1

The ratio of di-lepton production cross sections on a proton, using the $\gamma p\to l^{+}{l}^{-}p$ process, above and below di-muon production threshold allows to extract the effect…