Publication
Title
Photoproduction of $J/\Psi$ mesons at HERA
Author
Abstract
 We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8 +/- 2.2) nb is determined for 30 GeV less-than-or-equal-to W(gammap) less-than-or-equal-to 180 GeV and Q2 less-than-or-similar-to 4 GeV2. Using the flux of quasi-real photons with Q2 less-than-or-similar-to 4 GeV2, a total photoproduction cross section of sigma(gammap --> J/psiX) = (56 +/- 13 +/- 14) nb is derived at an average W(gammap) = 90 GeV. The distribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp (-b\t\) elow a \t\ of 0.75 GeV2 yielding a slope parameter of b = (4.7 +/- 1.9) GeV-2.
Language
English
Source (journal)
Physics letters: B. - Amsterdam, 1967, currens
Publication
Amsterdam : 1994
ISSN
0370-2693
Volume/pages
338:4(1994), p. 507-518
ISI
A1994PP67000012
Full text (Publishers DOI)
Full text (publishers version - intranet only)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address