Color-Octet Contributions to $J/ψ$ Photoproduction

Details Color-Octet Contributions to $J/ψ$ Photoproduction Color-Octet Contributions to $J/ψ$ Photoproduction

1996-01-16

arxiv.org/abs/hep-ph/9601276v1

Phys.Rev.Lett.76:4128-4131,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, epsfig, 4 figures

Scientific paper

10.1103/PhysRevLett.76.4128

We have calculated the leading color-octet contributions to the production of $J/\psi$ particles in photon-proton collisions. Using the values for the color-octet matrix elements extracted from fits to prompt $J/\psi$ data at the Tevatron, we demonstrate that distinctive color-octet signatures should be visible in $J/\psi$ photoproduction. However, these predictions appear at variance with recent experimental data obtained at HERA, indicating that the phenomenological importance of the color-octet contributions is smaller than expected from theoretical considerations and suggested by the Tevatron fits.

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