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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 4 Issue 1 (1998) pp 93-99
DOI 10.1007/s100529800752
theoretical physics:
Diffractive meson production from virtual photons with odd charge-parity exchange
R. Engel (1), D.Y. Ivanov (2)(3), R. Kirschner (2), L. Szymanowski (2)(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
Abstract. 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 $Q^2$ is $ m^2_C$.
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Online publication: June 10, 1998
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