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Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 May 2000 United Kingdom, United Kingdom, Italy, Italy, Italy, Germany, Italy, United Kingdom Publisher:Springer Science and Business Media LLCJournal:The European Physical Journal C, volume 14, pages 213-238 (issn: 1434-6044, eissn: 1434-6052,

Authors: Breitweg J; Chekanov S; Derrick M; Krakauer D; Magill S; Musgrave B; Pellegrino A; +193 Authors

doi: 10.1007/s100520000374

handle: 20.500.11770/126314 , 11577/2458513 , 11573/496863 , 2318/109641

Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA

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Abstract

Elastic and proton-dissociative photoproduction of rho /sup 0/, phi and J/ psi vector mesons ( gamma p to Vp, gamma p to VN, respectively) have been measured in e/sup +/p interactions at HERA up to -t=3 GeV/sup 2/, where t is the four-momentum transfer squared at the photon-vector-meson vertex. The analysis is based on a data sample in which photoproduction reactions were tagged by detection of the scattered positron in a special-purpose calorimeter. This limits the photon virtuality, Q/sup 2/, to values less than 0.01 GeV/sup 2/, and selects a gamma p average center-of-mass energy of [W]=94 GeV. Results for the differential cross sections, d sigma /dt, for rho /sup 0/, phi and J/ psi mesons are presented and compared to the results of recent QCD calculations. Results are also presented for the t-dependence of the pion-pair invariant-mass distribution in the rho /sup 0/ mass region and of the spin-density matrix elements determined from the decay-angle distributions. The Pomeron trajectory has been derived from measurements of the W dependence of the elastic differential cross sections d sigma /dt for both rho /sup 0/ and phi mesons.

Countries

United Kingdom, United Kingdom, Italy, Italy, Italy, Germany, Italy, United Kingdom

Related Organizations

Sapienza University of Rome
Italy
University of Glasgow
United Kingdom
University of Salford
United Kingdom
Helmholtz Association of German Research Centres
Germany
University of Calabria
Italy

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Keywords

J/psi(3100), rho(770)0, approx. 300 GeV-cms, diffraction: dissociation, energy dependence, ZEUS; ELASTIC-SCATTERING; LARGE-T; QCD; ELECTROPRODUCTION; J/PSI; RHO(0); PHOTON; SHRINKAGE; HYDROGEN, differential cross section: momentum transfer, mass spectrum: two-pion, photon p: exclusive reaction, angular distribution, quantum chromodynamics: perturbation theory, spin: density matrix, info:eu-repo/classification/ddc/530, QC, pomeron: exchange, positron p --> p vector meson positron, Phi(1020), ZEUS, positron p: colliding beams, DESY HERA Stor, QC Physics, vector meson: photoproduction, vector meson: hadronic decay, experimental results

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