Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data

Details Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data

2001-12-19

arxiv.org/abs/hep-ph/0112259v2

Phys.Rev.Lett.89:032001,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages (Latex), 3 figures (Postscript); updated experimental data included, references added, accepted for publication in Ph

Scientific paper

10.1103/PhysRevLett.89.032001

We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.

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