Journal article
Measurement of inelastic J/psi photoproduction at HERA
Zeitschrift für Physik. C, Particles and fields, Vol.76(4), pp.599-612
12/01/1997
DOI: 10.1007/s002880050583
Abstract
We present a measurement of the inelastic, non diffractive J/psi photoproduction cross section in the reaction e(+)p --> e(+)J/psi X with the ZEUS detector at HERA, The J/psi was identified using both the mu(+)mu(-) and e(+)e(-) decay channels and events were selected within the range 0.4 < z < 0.9 (0.5 < z < 0.9) for the muon (electron) decay mode, where z is the fraction of the photon energy carried by the J/psi in the proton rest frame. The cross section, the p(T)(2) and the z distributions, after having subtracted the contributions from resolved photon and diffractive proton dissociative processes, are given for the photon-proton centre of mass energy range 50 < W < 180 GeV; p(T)(2) is the square of the J/psi transverse momentum with respect to the incoming proton beam direction. In the kinematic range 0.4 < z < 0.9 and p(T)2 > 1 GeV(2), NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data, The predictions of a specific leading order colour-octet. model, as formulated to describe the CDP data on J/psi hadroproduction, are not consistent with the data.
Details
- Title: Subtitle
- Measurement of inelastic J/psi photoproduction at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)U Mallik (Contributor)
- Resource Type
- Journal article
- Publication Details
- Zeitschrift für Physik. C, Particles and fields, Vol.76(4), pp.599-612
- DOI
- 10.1007/s002880050583
- ISSN
- 0170-9739
- eISSN
- 1431-5858
- Publisher
- Springer Nature
- Number of pages
- 14
- Language
- English
- Date published
- 12/01/1997
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627316302771
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