Journal article
Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA
The European physical journal. C, Particles and fields, Vol.14(2), pp.213-238
05/01/2000
DOI: 10.1007/s100520000374
Abstract
Elastic and proton-dissociative photoproduction of rho(0), phi and J/psi vector mesons (gamma p --> Vp, gamma p --> VN, respectively) have been measured in e(+)p interactions at HERA up to -t = 3 GeV2, 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(2), to values less than 0.01 GeV2, 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(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(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(0) and phi mesons.
Details
- Title: Subtitle
- Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)U Mallik (Contributor)
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.14(2), pp.213-238
- DOI
- 10.1007/s100520000374
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Publisher
- Springer Nature
- Number of pages
- 26
- Language
- English
- Date published
- 05/01/2000
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627341802771
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