Journal article
Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA
The European physical journal. C, Particles and fields, Vol.26(3), pp.389-409
01/01/2003
DOI: 10.1140/epjc/s2002-01079-0
Abstract
Diffractive photoproduction of vector mesons, gammap --> VY, where Y is a proton-dissociative system, has been measured in e(+)p interactions with the ZEUS detector at HERA using an integrated luminosity of 25 pb(-1). The differential cross section, dsigma/dt, is presented for 1.2 < -t < 12 GeV2, where t is the square of the four-momentum transferred to the vector meson. The data span the range in photon-proton centre-of-mass energy, W, from 80 GeV to 120 GeV. The t distributions are well fit by a power law, dsigma/dt proportional to (-t)(-n). The slope of the effective Pomeron trajectory, measured from the W dependence of the rho(0) and phi cross sections in bins of t, is consistent with zero. The ratios dsigma(gammap-->phiY)/dt to dsigma(gammap-->rho0Y)/dt and dsigma(gammap-->J/psiY)/dt to dsigma(gammap-->rho0Y)/dt increase with increasing -t. Decay- angle analyses for rho(0), phi and J/psi) mesons have been carried out. For the rho(0) and phi mesons, contributions from single and double helicity flip are observed. The results are compared to expectations of theoretical models.
Details
- Title: Subtitle
- Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.26(3), pp.389-409
- DOI
- 10.1140/epjc/s2002-01079-0
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Publisher
- Springer Nature
- Number of pages
- 21
- Language
- English
- Date published
- 01/01/2003
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627341102771
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