Calculation of two-photon exchange effects for $Δ$ production in electron-proton collisions

Details Calculation of two-photon exchange effects for $Δ$ production in electron-proton collisions Calculation of two-photon exchange effects for $Δ$ production in electron-proton collisions

2006-01-20

arxiv.org/abs/nucl-th/0601063v3

Nucl.Phys.A778:44-52,2006

Physics

Nuclear Physics

Nuclear Theory

10 pages, 2 figures, RevTeX4; more detailed discussion, results unchanged; to be published in Nucl.Phys.A

Scientific paper

10.1016/j.nuclphysa.2006.07.038

We present an evaluation of a two-photon exchange correction to the cross section for unpolarized $\Delta$ 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 $\Delta$ intermediate states. We find a relation between the angular nonlinearity of the two-photon exchange contribution and the value of the $\gamma \Delta \Delta$ coupling constant.

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