Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-16
Phys.Rev. D56 (1997) 5820-5833
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages (Latex), 12 figures (Postscript)
Scientific paper
10.1103/PhysRevD.56.5820
The cross section for the photoproduction of large-p_T J/psi mesons at HERA is calculated at next-to-leading order, adopting a perturbative approach to describe the fragmentation of charm quarks and gluons into J/psi mesons. We treat the charm quark according to the massless factorization scheme, where it is assumed to be one of the active flavours inside the proton and the resolved photon. We present inclusive distributions in transverse momentum and rapidity, including the contributions due to direct and resolved photons. The importance of the colour-octet components of the J/psi wave function, which contribute to the fragmentation process, is emphasized. In addition to prompt J/psi production, we consider also the production of chi_{cJ} states followed by radiative decays to J/psi mesons, both in the colour-singlet and colour-octet channels.
Kniehl Bernd A.
Kramer Gustav
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