Mass Effects in Hard Exclusive Photoproduction of $J/Ψ$ Mesons

Details Mass Effects in Hard Exclusive Photoproduction of $J/Ψ$ Mesons Mass Effects in Hard Exclusive Photoproduction of $J/Ψ$ Mesons

2002-06-20

arxiv.org/abs/hep-ph/0206189v1

Nucl.Phys. A711 (2002) 203-206

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 eps-figures, uses espcrc1.sty

Scientific paper

10.1016/S0375-9474(02)01217-4

We report on an attempt to describe hard exclusive photoproduction of $J/\Psi$ mesons, i.e. the reaction $\gamma p \to J/\Psi p$, by means of a modified version of the hard-scattering approach, in which the proton is treated as a quark-diquark rather than a three-quark system. In order to improve the applicability of the model at momentum transfers of only a few GeV we take into account constituent-mass effects in the calculation of the perturbative scattering amplitude. With a standard $J/\Psi$-meson distribution amplitude and diquark-model parameters adopted from preceding investigations of other photon-induced reactions our predictions for differential cross sections overestimate the naive extrapolation of the low-momentum transfer ZEUS data. Our results, however, reveal the importance of taking into account the charm-quark mass.

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