Published June 2009 | Version v1
Report Restricted

Measurement of J/ψ helicity distributions in inelastic photoproduction at HERA

Creators

  • 1. Argonne National Lab., Argonne, IL (United States)

Description

The J/ψ 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/ψ mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the μ+ were measured in the J/ψ rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD. (orig.)

Availability note (English)

Available from INIS in electronic form

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Additional details

Publishing Information

Imprint Pagination
23 p.
ISSN
0418-9833
Report number
DESY--09-077

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
40073473
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANGULAR DISTRIBUTION; ANTILEPTON-PROTON INTERACTIONS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; ELECTROPRODUCTION; EXPERIMENTAL DATA; GEV RANGE 10-100; GEV RANGE 100-1000; HELICITY; J PSI-3097 MESONS; LEPTONIC DECAY; MUON PAIRS; MUONS MINUS; MUONS PLUS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; POLARIZATION-ASYMMETRY RATIO; POLARIZED PRODUCTS; POSITRONS
Descriptors DEC
ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; CHARMONIUM; DATA; DECAY; DIMENSIONLESS NUMBERS; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELECTRON-NUCLEON INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTON-PROTON INTERACTIONS; LEPTONS; MATTER; MESONS; MUONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; QUARKONIUM; VECTOR MESONS; WEAK INTERACTIONS; WEAK PARTICLE DECAY

Optional Information

Collaborations
ZEUS Collaboration