Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA

Details Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA

1997-03-10

arxiv.org/abs/hep-ph/9703280v1

Phys.Lett. B413 (1997) 416-421

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages (Latex), 3 figures (Postscript)

Scientific paper

10.1016/S0370-2693(97)01126-X

We study J/psi photoproduction via fragmentation at next-to-leading order in the QCD-improved parton model, using the nonrelativistic factorization formalism proposed by Bodwin, Braaten, and Lepage. We consider direct and resolved photoproduction of prompt J/psi mesons and chi_{cJ} mesons radiatively decaying to J/psi+gamma, taking into account the formation of both color-singlet and color-octet c anti-c states. Adopting the values of the long-distance color-octet matrix elements extracted from fits to prompt-J/psi data recently taken at the Fermilab Tevatron, we predict that measurements of J/psi photoproduction at DESY HERA should show a distinctive excess over the expectation based on the color-singlet model at small values of the inelasticity variable z. This is complementary to the expected enhancement at z close to 1 due to the color-octet contribution to photon-gluon fusion.

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