Calculation of two-photon exchange effects for production in electron-proton collisions
Abstract
We present an evaluation of a two-photon exchange correction to the cross section for unpolarized isobar production in electron-proton collisions, using a relativistic, crossing symmetric and gauge invariant approach. The calculated box and crossed-box diagrams include nucleon and intermediate states. We find a relation between the angular nonlinearity of the two-photon exchange contribution and the value of the γ coupling constant.
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