J/ψpolarization in photo-production up-to the next-to-leading order of QCD

Details J/ψpolarization in photo-production up-to the next-to-leading order of QCD J/ψpolarization in photo-production up-to the next-to-leading order of QCD

2009-01-29

arxiv.org/abs/0901.4749v3

Phys.Rev.D80:034020,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures. Discussion on the theoretical uncertainties from the choice of renormalization scale was added

Scientific paper

10.1103/PhysRevD.80.034020

We investigate the J/psi polarization in photoproduction at the Hadron Electron Ring Accelerator(HERA) up to the next-to-leading order of QCD. The results show that the transverse momentum p_t and energy fraction z distributions of J/psi production do not agree with the observed ones very well. The theoretical uncertainties for the z distributions of the J/psi polarization parameters with respect to various choices of the renormalization and factorization scales are too large to give an accurate prediction. The uncertainties for the p_t distributions of these parameters are small when p_t>3GeV and the obtained p_t distributions can not describe the experimental data even in this region.

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