|
Title
|
|
|
|
Photoproduction of 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
:
North-Holland
,
1994
|
|
|
ISSN
|
|
|
|
0370-2693
|
|
|
DOI
|
|
|
|
10.1016/0370-2693(94)90806-0
|
|
|
Volume/pages
|
|
|
|
338
:4
(1994)
, p. 507-518
|
|
|
ISI
|
|
|
|
A1994PP67000012
|
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|
|
Full text (publisher's version - intranet only)
|
|
|
|
|
|