Color-Octet Contributions to J/ Photoproduction
Abstract
We have calculated the leading color-octet contributions to the production of J/ particles in photon-proton collisions. Using the values for the color-octet matrix elements extracted from fits to prompt J/ data at the Tevatron, we demonstrate that distinctive color-octet signatures should be visible in J/ 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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