H1 Collaboration, . and Aktas, A. and Sloan, T. and Henderson, R. , et al. (2003) Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA. Physics Letters B, 568 (3-4). pp. 205-218. ISSN 0370-2693Full text not available from this repository.
The diffractive photoproduction of J/ψ mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb−1. The differential cross section dσ(γp→J/ψY)/dt is studied in the range 2<|t|<30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon–proton centre-of-mass energy Wγp in three t intervals, spanning the range 50<Wγp<200 GeV. A fast rise of the cross section with Wγp is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be ′=−0.0135±0.0074(stat.)±0.0051(syst.) GeV−2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation.
|Journal or Publication Title:||Physics Letters B|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited By:||Mrs Yaling Zhang|
|Deposited On:||17 Jul 2008 13:42|
|Last Modified:||26 Jul 2012 14:50|
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