2023 Impact factor 4.2
Particles and Fields
Eur. Phys. J. C 4, 93-99
DOI 10.1007/s100529800752

Diffractive meson production from virtual photons
with odd charge-parity exchange

R. Engel1 - D.Yu. Ivanov2,3 - R. Kirschner2 - L. Szymanowski2,4

1 Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany
2 Naturwissenschaftlich-Theoretisches Zentrum und Institut für Theoretische Physik, Universität Leipzig D-04109 Leipzig, Germany
3 Institute of Mathematics, 630090 Novosibirsk, Russia
4 Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw, Poland

Received: 30 July 1997/ Published online: 20 February 1998

We calculate the cross section of diffractive charge-parity C=+1 neutral meson production in virtual photon proton collision at high energies. Due to the opposite C-parities of photon and meson M+ ($M^+ = \eta_C, \pi^0, a_2$) this process probes the t-channel C=-1 odderon exchange which is described here as noninteracting three-gluon exchange. Estimates for the cross section of inelastic diffractive process $\gamma^* p\to \eta_C X_p$ are presented. The total cross section of diffractive $\eta_C$ meson photoproduction is found to be 47 pb. The cross sections for the diffractive production of light mesons ($\pi^0, a_2$)in $\gamma^* p$ collisions are of the same order if the photon virtuality Q2 is m2C.

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