Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-10-18
Nucl.Phys. B460 (1996) 109-126
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages+7 Figures as one compressed and encoded postcript file
Scientific paper
10.1016/0550-3213(95)00631-1
We analyse inclusive photoproduction of polarized $^3P_1$ 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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