Title
Elastic and inelastic photoproduction of <tex>$J/\psi$</tex> mesons at HERA Elastic and inelastic photoproduction of <tex>$J/\psi$</tex> mesons at HERA
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Nuclear physics: B. - Amsterdam
Volume/pages
472(1996) :1/2 , p. 3-31
ISSN
0550-3213
0029-5582
ISI
A1996UX86300001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Results on J/psi production in ep interactions in the Hi experiment at HERA are presented. The J/psi mesons are produced by almost real photons (Q(2) approximate to 0) and detected via their leptonic decays. The data have been taken in 1994 and correspond to an integrated luminosity of 2.7 pb(-1). The yp cross section for elastic J/psi production is observed to increase strongly with the center of mass energy. The cross section for diffractive J/psi production with proton dissociation is found to be of similar magnitude as the elastic cross section. Distributions of transverse momentum and decay angle are studied and found to be in accord with a diffractive production mechanism. For inelastic J/psi production the total yp cross section, the distribution of transverse momenta, and the elasticity of the J/psi are compared to NLO QCD calculations in a colour singlet model and agreement is found. Diffractive psi' production has been observed and a first estimate of the ratio to J/psi production in the HERA energy regime is given.
E-info
https://repository.uantwerpen.be/docman/iruaauth/b2de15/edb2363.pdf
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