Hard exclusive photoproduction of $Φ$ mesons

Details Hard exclusive photoproduction of $Φ$ mesons Hard exclusive photoproduction of $Φ$ mesons

1999-10-27

arxiv.org/abs/hep-ph/9910509v1

Phys.Rev. D61 (2000) 114026

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages, 7 figures, uses RevTeX style

Scientific paper

10.1103/PhysRevD.61.114026

We calculate the differential cross section and single-polarization observables for the reaction $\gamma p \to \Phi p$ within perturbative QCD, treating the proton as a quark-diquark system. The phenomenological couplings of gauge bosons to (spatially extended) diquarks and the quark-diquark distribution amplitude of the proton are adopted from previous investigations of baryon form factors and two-photon processes. Going beyond leading order, we take into account hadron-mass effects by means of a systematic expansion in the small parameter (hadron mass/ photon energy). With the $\Phi$-meson distribution amplitude taken from the literature our predictions for the differential cross section at $| t | \agt 4 \text{GeV}^2$ seem to provide a reasonable extrapolation of the low-t data and are also comparable in magnitude with the results of a two-gluon exchange model in which the gluons are considered as a remnant of the pomeron. For momentum transfers of a few GeV hadron-mass effects appear still to be sizeable.

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