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

✍ Scribed by S. Kondratyuk; P.G. Blunden

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
125 KB
Volume
778
Category
Article
ISSN
0375-9474

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✦ Synopsis

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

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## Abstract The experimental investigation of site‐specific intra‐ionic hydrogen/deuterium (H/D) exchange in the low‐energy collision‐induced dissociation (CID) product ion spectra of protonated small molecules generated by electrospray ionisation (ESI) is presented. The observation of intra‐ionic