Production of J/psi Mesons at HERA

Details Production of J/psi Mesons at HERA Production of J/psi Mesons at HERA

2001-10-14

arxiv.org/abs/hep-ex/0110023v1

J.Phys.G28:997-1010,2002

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 12 figures, contribution to Ringberg 2001

Scientific paper

10.1088/0954-3899/28/5/322

Inelastic and diffractive production of J/psi mesons at HERA is reviewed. The data on inelastic photoproduction are described well within errors by the Colour Singlet Model in next-to-leading order. A search for colour octet processes predicted within the NRQCD/factorisation approach is conducted in many regions of phase space. No unambiguous evidence has been found to date. Diffractive elastic production of J/psi mesons has been measured in the limit of photoproduction up to the highest photon proton center of mass energies. The increase of the cross section is described by pQCD models. At larger Q^2, the W dependence is found to be similar to that observed in photoproduction. First analyses of data at high t yield a powerlike dependence on |t|. A LO BFKL calculation gives a good description of the data.

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