Study of exclusive vector meson production with H1

Journal Article · Sun Apr 20 04:00:00 EDT 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.53645· OSTI ID:21167607

Gaede, F ^[1]

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1. Max-Planck-Institut fuer Physik, Werner-Heisenberg-Institut, Foehringer Ring 6, D-80805 Muenchen (Germany)

The H1 experiment at the ep-collider HERA at DESY in Hamburg, has investigated the diffractive production of vector mesons in photoproduction and at large photon virtualities, Q{sup 2}. The photoproduction of {rho}{sup 0} shows the characteristics of soft diffractive physics, as expected from Regge theory, whereas the heavier J/{psi} deviates from this picture. Its production is well described by QCD-models, relating the cross section to the gluon content of the proton. The {rho}{sup 0}, {phi} and J/{psi} electroproduction cross sections are measured as a function of the hadronic centre of mass energy, W{sub {gamma}}{sub p} and also differentially in Q{sup 2} and the square of the four-momentum transferred, t. The helicity structure is studied through the decay angular distribution. The production of the higher mass excitations {rho}{sup '} and {psi}{sup '} has been observed. Electroproduction of {rho}{sup 0} with diffractive proton dissociation shows a similar behaviour to the elastic case, except for a harder t spectrum.

• OSTI ID: 21167607
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 407; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
CROSS SECTIONS
DIFFRACTION MODELS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
EXCITATION
EXCLUSIVE INTERACTIONS
FOUR MOMENTUM TRANSFER
GLUONS
HELICITY
HERA STORAGE RING
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHI MESONS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
REST MASS
RHO-770 MESONS