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Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA.

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 0370-2693

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Abstract

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.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 10552
Deposited By: Mrs Yaling Zhang
Deposited On: 17 Jul 2008 13:42
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 10:53
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10552

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