J/psi production via fragmentation at HERA

Abstract

We compute the contributions to large-$p_T$ $J/\psi$ production at HERA coming from fragmentation of gluons and charm quarks. We find that the charm quark fragmentation contribution dominates over the direct production of $J/\psi$ via photon-gluon fusion at large-$p_T$, while the gluon fragmentation is negligibly small over the whole range of $p_T$. An experimental study of $p_T$ distributions of $J/\psi$ at HERA will provide a direct probe of the charm quark fragmentation functions.

9 pages (Latex) plus 2 figures enclosed as a uuencoded file

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• New Observables in Inclusive Production of Quarkonia
• Theory of hard photoproduction
• Color-octet mechanism in $\gamma +p\to J/\psi +X$
• Inelastic photoproduction of polarised $J/\psi$
• Quarkonium Photoproduction at Next-to-leading Order
• Large-P_T inclusive photoproduction of J/psi in electron-proton collisions at HERA and the EIC
• Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA
• Charmonium Production via Fragmentation at DESY HERA
• J/ψproduction through resolved photon processes at e+ e- colliders
• Photoproduction of fully charmed tetraquark at electron-ion colliders
• J/Psi and Psi' Polarizations in Polarized Proton-Proton Collisions at the RHIC
• Physics at ELFE
• Color-octet mechanism and J/psi polarization at LEP
• Associated J/psi + gamma Photoproduction as a Probe of the Colour-Octet Mechanism
• On relative contributions of fusion and fragmentation mechanisms in J/psi photoproduction at high energy
• ${\chi }_{cJ}$ Polarization in Polarized Proton-Proton Collisions at RHIC
• Heavy-Flavour Production at HERA