Inclusive Photoproduction of Polarized ${}^3{P}_1$ Quarkonium

Abstract

We analyse inclusive photoproduction of polarized ${}^3{P}_1$ quarkonium in the framework of QCD. To separate nonperturbative and perturbative parts in the density matrix of the produced quarkonium we use a method , which is equivalent to the diagramatic expansion widely used in analysing deeply inelastic scatterings. A systematic expansion in a small velocity $v$, with which a heavy quark moves inside the quarkonium in its rest frame, is performed for the nonperturbative parts, and they are expressed as matrix elements in nonrelativistic QCD. At the leading order of $v$ there are four matrix elements representing nonperturbative physics. The perturbative parts are calculated at the leading order of coupling constants. Some numerical results, especially, numerical results for HERA are given.

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References in corpus (5)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Gluon Fragmentation into P-wave Heavy Quarkonium
• Inelastic J/psi Photoproduction
• Gluon Fragmentation into ${}^3{P}_J$ Quarkonium

Cited by in corpus (9)

• NLO Production and Decay of Quarkonium
• Quarkonium Production at High-Energy Colliders
• Production of Heavy Quarkonium in High Energy Colliders
• Theory of hard photoproduction
• Quarkonium Photoproduction at Next-to-leading Order
• Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA
• A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories
• Higher Twist Effect in Inclusive Quarkonium Photoproduction
• Color-Singlet and Color-Octet Contributions to $J/\psi$ Photoproduction