Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-06-22
Phys.Lett. B387 (1996) 181-186
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 11 pages, 4 embedded figures, uses epsfig.sty
Scientific paper
10.1016/0370-2693(96)00999-9
Quarkonium production in high-energy reactions is found to exhibit a behaviour more universal than that expected from velocity scaling. Total rates of quarkonia produced in hadronic interactions as well as Feynman-x and transverse momentum distributions can be described over the full range of accessible energies (15 < sqrt{s} < 1800 GeV) by two-stage processes. The quarkonium production cross section factors into a process-dependent short-distance part and a single long-distance matrix element. The first part describing the production of a free quark--antiquark pair is the perturbatively calculated subthreshold cross section. The non-perturbative factor turns out to be universal, giving the model great predictive power. Furthermore we estimate the fraction of the heavy-quark cross section leading to quarkonium for both the charm and bottom systems. Finally, we comment on quarkonium photoproduction.
Schuler Gerhard A.
Vogt Ramona
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