Abstract
The J/psi decay angular distributions have been measured in inelastic photoproduction in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb(-1). The range in photon-proton centre-of-mass energy, W, was 50 <W <180 GeV. The J/psi mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the mu(+) were measured in the J/psi rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD.
Original language | English |
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Article number | 007 |
Number of pages | 22 |
Journal | Journal of High Energy Physics |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec-2009 |
Keywords
- Lepton-Nucleon Scattering
- CENTRAL TRACKING DETECTOR
- ZEUS BARREL CALORIMETER
- DESIGN
- CONSTRUCTION
- GLUONS
- ENERGY
- POLARIZATION
- QUARKONIUM
- LUMINOSITY
- PHYSICS