منابع مشابه
Inelastic 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 کاملInelastic photoproduction of polarised J/ψ
The comparison of J/ψ photoproduction data in the inelastic region with theoretical predictions based on the NRQCD approach has remained somewhat ambiguous and controversial, in particular at large values of the inelasticity variable z. We study the polar and azimuthal decay angular distribution of J/ψ mesons as functions of z and transverse momentum pt. Future measurements of decay angular dis...
متن کاملQCD Corrections to Inelastic J/ψ Photoproduction
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 availa...
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 کاملMeasurement of inelastic J / ψ and ψ ′ photoproduction at HERA
The cross sections for inelastic photoproduction of J/ψ and ψ ′ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb −1 collected in the period 1996–2007. The ψ ′ to J/ψ cross section ratio was measured in the range 0.55 < z < 0.9 and 60 < W < 190 GeV as a function of W , z and p T. Here W denotes the photon-proton centre-of-mass en...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(95)00155-e