Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-04
Phys.Lett. B470 (1999) 200-208
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages including 5 postscript figures
Scientific paper
10.1016/S0370-2693(99)01287-3
We investigate the possibility that the process of phi photoproduction may have a significant hard perturbative QCD component. This suggestion is based on a study of the energy dependence of the forward phi photoproduction cross section followed by a calculation where we show that a coherent sum of the pQCD and conventional soft Pomeron contributions provides an excellent reproduction of the experimental data. Our results suggest that the transition from the predominantly soft photoproduction of light rho and omega vector mesons to the predominantly hard photoproduction of heavy J/psi and upsilon is smooth and gradual, similar to the transition observed in deep inelastic scattering studies of the proton structure function in the small x limit. Our predictions for higher HERA energies are presented.
Ferreira Erasmo
Maor Uri
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