QCD Corrections to Inelastic J/ψ Photoproduction
نویسنده
چکیده
We present a complete calculation of the higher-order perturbative QCD corrections to inelastic photoproduction of J/ψ particles. A comprehensive analysis of total cross sections and differential distributions for the energy range of the fixed-target experiments and for inelastic J/ψ photoproduction at HERA is performed. The cross section and the J/ψ energy spectrum are compared with the available photoproduction data including first results from HERA. This analysis will not only provide information on the gluon distribution of the proton but appears to be a clean test for the underlying picture of quarkonium production as developed so far in the perturbative QCD sector. ⋆ E-mail: [email protected]
منابع مشابه
Color-singlet and Color-octet Contributions to J/ψ Photoproduction *
I discuss the impact of color-octet contributions and higher-order QCD corrections on the cross section for inelastic J/ψ photoproduction. The theoretical predictions are compared with recent experimental data obtained at HERA.
متن کاملPhotoproduction Constraints on J/ψ-Nucleon Interactions
Using J/ψ and open charm photoproduction data, we apply the vector meson dominance model to obtain constraints on the energy dependence of the inelastic J/ψ-nucleon cross section. Predictions of short distance QCD are in accord with these constraints, while recently proposed hadronic models for J/ψ dissociation strongly violate them. The energy dependence of the inelastic J/ψ-nucleon cross sect...
متن کاملInelastic J== Photoproduction
Inelastic photoproduction of J/ψ particles at high energies is one of the processes to determine the gluon distribution in the nucleon. We have calculated the QCD radiative corrections to the color-singlet model of this reaction. They are large at moderate photon energies, but decrease with increasing energies. The cross section and the J/ψ energy spectrum are compared with the available fixed-...
متن کاملHigher-Order Effects on Inelastic J/ψ Photoproduction
Approximately taking into account the higher-order effects due to multiple-gluon initial-state radiation, we extract from the latest Tevatron data of prompt J/ψ hadroproduction the leading colour-octet matrix elements within the nonrelativistic-QCD (NRQCD) factorization formalism. We find that the matrix elements which describe the formation of J/ψ mesons from colour-octet cc̄ pairs in the angul...
متن کاملInelastic J/ψ production at HERA
Inelastic J/ψ photoproduction is an interesting area where one can test QCD predictions. This article reviews the recent experimental results obtained by the ZEUS and H1 Collaborations. Single differential and double differential cross sections have been measured by the H1 Collaboration using an integrated luminosity of 166 pb −1 , taken in the years 2006-2007. The J/ψ decay angular distributio...
متن کامل