New Data on elastic J/{psi} Production from H1 at HERA
- Max-Planck-Insitute for Physics, Foehringer Ring 6, D-80805 Munich (Germany)
New data on cross sections for elastic production of J/{psi} mesons in photoproduction and electroproduction are presented for photon virtualities Q2 up to 80 GeV2. The photon-proton center-of-mass energy W{gamma}p covers the ranges 40 {<=} W{gamma}p {<=} 305 GeV in photoproduction and 40 {<=} W{gamma}p {<=} 160 GeV in electroproduction. The steep rise of the cross sections with W{gamma}p is confirmed. Differential cross sections d{sigma}/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range |t| < 1.2 GeV2 as functions of W{gamma}p and Q2 . An analysis of the J/{psi} production and decay angular distributions yields no evidence for a violation of s-channel helicity conservation. The ratio of the cross sections for longitudinal and transverse photons is measured as a function of Q2 and is found to be described by perturbative QCD models.
- OSTI ID:
- 20726468
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 792; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANGULAR DISTRIBUTION
CROSS SECTIONS
ELECTROPRODUCTION
FOUR MOMENTUM TRANSFER
GEV RANGE
HELICITY
HERA STORAGE RING
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
NUCLEAR REACTION YIELD
PARTICLE DECAY
PARTICLE IDENTIFICATION
PHOTON-PROTON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
PROTONS
QUANTUM CHROMODYNAMICS
S CHANNEL