J/psi production at HERA

Details J/psi production at HERA J/psi production at HERA

2009-01-28

arxiv.org/abs/0901.4352v2

Phys.Rev.Lett.102:142001,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, added references

Scientific paper

10.1103/PhysRevLett.102.142001

We consider the J/psi photo-production data collected at HERA in the light of next-to-leading order predictions for the color-singlet yield and polarization. We find that, while the shapes of inclusive distributions in the transverse momentum and inelasticity are well reproduced, the experimental rates are larger than those given by the color-singlet contribution alone. Furthermore, the next-to-leading order calculation predicts the J/psi's to be mostly longitudinally polarized at high transverse momentum in contrast with the trend of the preliminary data from the ZEUS collaboration.

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