J/psi production at HERA - INSPIRE

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J/psi production at HERA

P. Artoisenet
(
- Louvain U. and
- Louvain U., CP3
)
,
John M. Campbell
(
- Glasgow U.
)
,
F. Maltoni
(
- Louvain U. and
- Louvain U., CP3
)
,
F. Tramontano
(
- Naples U. and
- INFN, Naples
)

Jan, 2009

4 pages

Published in:

Phys.Rev.Lett. 102 (2009) 142001

e-Print:

0901.4352 [hep-ph]

DOI:

10.1103/PhysRevLett.102.142001

Report number:

CP3-09-04

View in:

ADS Abstract Service

reference search75 citations

Citations per year

Abstract: (arXiv)

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.

13.85.Ni
14.40.Gx
12.38.Bx
J/psi(3100): photoproduction
differential cross section: transverse momentum
color: singlet
DESY HERA Stor
J/psi(3100): polarization
ZEUS
electron p: interaction

References(21)

Figures(4)

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