Charmonium Production via Fragmentation at DESY HERA

Abstract

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.

32 pages (Latex), 12 figures (Postscript)

References in corpus (1)

• Differential Cross Sections of D*+- Photoproduction in ep Collisions at HERA

Cited by in corpus (18)

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• Inelastic photoproduction of polarised $J/\psi$
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• Large-P_T inclusive photoproduction of J/psi in electron-proton collisions at HERA and the EIC
• Quark fragmentation into spin-triplet $S$-wave quarkonium
• J/ψproduction through resolved photon processes at e+ e- colliders
• J/Psi and Psi' Polarizations in Polarized Proton-Proton Collisions at the RHIC
• On relative contributions of fusion and fragmentation mechanisms in J/psi photoproduction at high energy
• Photoproduction of $J/\psi$ with forward hadron tagging in hadronic collisions
• Massive-Evolution Effects on Charmonium Hadroproduction
• Heavy-Flavour Production at HERA
• ${\chi }_{cJ}$ Polarization in Polarized Proton-Proton Collisions at RHIC
• Production of J/psi Mesons at HERA