Odderon and photon exchange in pseudoscalar meson production

Details Odderon and photon exchange in pseudoscalar meson production Odderon and photon exchange in pseudoscalar meson production

1999-05-27

arxiv.org/abs/hep-ph/9905519v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at DIS99, Berlin-Zeuthen, Germany, 19-23 April 99

Scientific paper

10.1016/S0920-5632(99)00721-5

We consider exclusive $\pi^0$ production in ep-scattering. At high energies odderon and photon exchange contribute. 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 $\pi^0$ production cross section. Observing our process at HERA would establish the soft odderon.

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