Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages 4 figures
Scientific paper
The two photon exchange amplitude is investigated in frame of analytic properties of the virtual Compton scattering amplitude as a function of the invariant mass squared of the intermediate hadronic state. A sum rule is built, based on arguments from analyticity. It relates the differential cross section of elastic electron-proton scattering including form factors, and the cross section of inelastic scattering channel, with a contribution of nucleon anti-nucleon pair production arising from the Fermi statistics. The last term is calculated in frame of a simple model of nucleon-pion interaction.
Bakmaev S.
Bytev Vladimir V.
Kuraev Eduard A.
Tomasi-Gustafsson Egle
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