Journal
NUCLEAR PHYSICS A
Volume 778, Issue 1-2, Pages 44-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2006.07.038
Keywords
two-photon exchange effects; inelastic electron-proton scattering
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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. (c) 2006 Elsevier B.V. All rights reserved.
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