J/{psi} Production at HERA

Journal Article · Fri Apr 10 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.142001· OSTI ID:21180350

Artoisenet, P; Maltoni, F ^[1]; Campbell, J ^[2]; Tramontano, F ^[3]

---

1. Center for Particle Physics and Phenomenology (CP3), Universite catholique de Louvain, B-1348 Louvain-la-Neuve (Belgium)
2. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom)
3. Universita di Napoli Federico II, Dipartimento di Scienze Fisiche, and INFN, Sezione di Napoli, I-80126 Napoli (Italy)

We consider the J/{psi} photoproduction data collected at the DESY ep collider HERA in the light of next-to-leading order predictions for the color-singlet yield and polarization. We find that, while the shapes of inclusive distributions in the transverse momentum and inelasticity are well reproduced, the experimental rates are larger than those given by the color-singlet contribution alone. Furthermore, the next-to-leading order calculation predicts the J/{psi}'s to be mostly longitudinally polarized at high transverse momentum in contrast with the trend of the preliminary data from the ZEUS Collaboration.

• OSTI ID: 21180350
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLOR MODEL
DESY
HERA STORAGE RING
INCLUSIVE INTERACTIONS
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTOPRODUCTION
POLARIZATION
TRANSVERSE MOMENTUM