Forward Cone in Exclusive Heavy Vector Meson Production

Details Forward Cone in Exclusive Heavy Vector Meson Production Forward Cone in Exclusive Heavy Vector Meson Production

1998-04-26

arxiv.org/abs/hep-ph/9804406v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex

Scientific paper

The color dipole gBFKL phenomenology of a diffraction cone for photo- and electroproduction $\gamma^{*}N \to VN$ of heavy vector mesons (charmonium & bottonium) at HERA and in fixed target experiments is presented. A substantial shrinkage of the diffraction cone from the CERN/FNAL to the HERA range of c.m.s. energy $W$ is predicted. The $Q^{2}$-controlled selectivity to the color dipole size (scanning phenomenon) is shown to lead to a decrease of the diffraction slope with $Q^{2}$ (which is supported by the available experimental data). An approximate flavor independence of the diffraction slope in the scaling variable $Q^{2}+m_{V}^{2}$ is shown to hold.

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