A fresh look at diffractive $J/ψ$ photoproduction at HERA, with predictions for THERA

Details A fresh look at diffractive $J/ψ$ photoproduction at HERA, with predictions for THERA A fresh look at diffractive $J/ψ$ photoproduction at HERA, with predictions for THERA

2000-09-07

arxiv.org/abs/hep-ph/0009086v2

JHEP 0103:045,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

Published version, 29 pages, 16 figures, uses JHEP.cls. Substantially rewritten to better emphasize the generality of the resu

Scientific paper

10.1088/1126-6708/2001/03/045

We quantify perturbative and non-perturbative QCD effects in the exclusive $J/\psi$-photoproduction cross section, and in the shrinkage of the differential cross section with respect to momentum transfer, $t$. We predict that in the high energy THERA region there will always be a significant contribution to this process that rises quickly with energy. This implies that the taming of the rise of the cross section with energy, due to both the expansion of spatially-small fluctuations in the photon and to higher twist effects, is rather gradual.

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