### Odderon and photon exchange in electroproduction of pseudoscalar mesonsOdderon and photon exchange in electroproduction of pseudoscalar mesons

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 Author Berger, E. R. ♦ Donnachie, A. ♦ Dosch, H. G. ♦ Kilian, W. ♦ Nachtmann, O. ♦ Rueter, M. Source arXiv.org Content type Text File Format PDF Date of Submission 1999-01-21 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword High Energy Physics - Phenomenology ♦ physics:hep-ph Abstract We investigate the reaction $e p \to e PS X$ where PS denotes a pseudoscalar meson $\pi^0, \eta, \eta'$, or $\eta_c$ and X either a proton or resonance or continuum states into which the proton can go by diffractive excitation. At high energies photon and odderon exchange contribute to the reaction. The photon exchange contribution is evaluated exactly using data for the total virtual photon-proton absorption cross section. The odderon exchange contribution is calculated in nonperturbative QCD, using functional integral techniques and the model of the stochastic vacuum. For the proton we assume a quark-diquark structure as suggested by the small odderon amplitude in $pp$ and $p \bar{p}$ forward scattering. We show that odderon exchange leads to a much larger inelastic than elastic PS production cross section. Observation of our reaction at HERA would establish the soft odderon as an exchange object on an equal footing with the soft pomeron and would give us valuable insight into both the nucleon structure and the mechanism of high energy diffractive scattering. Description Reference: Eur.Phys.J.C9:491-501,1999 Educational Use Research Learning Resource Type Article Page Count 20