Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-12
Phys.Rev.D62:034022,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LaTeX, with 6 eps figs included with epsfig.sty
Scientific paper
10.1103/PhysRevD.62.034022
We investigate $J/\psi$ photoproduction asymmetries in the framework of the NRQCD factorization approach. It is shown that the color octet contribution leads to large uncertainties in the predicted asymmetries which rules out the possibility to precisely measure the gluon polarization in the nucleon through this final state. For small values of the color octet parameters being compatible with $J/\psi$ photoproduction data it appears possible that a measurement of $J/\psi$ asymmetries could provide a new test for the NRQCD factorization approach, on one hand, or a measurement of the polarized gluon distribution from low inelasticity events $(z<0.7)$, on the other
Japaridze George
Nowak Wolf-Dieter
Tkabladze Avto
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