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

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dc.creatorKlasen, M.
dc.creatorKniehl, B. A.
dc.creatorMihaila, L. N.
dc.creatorSteinhauser, M.
dc.date2001-12-19
dc.date2002-06-13
dc.date.accessioned2026-07-07T11:31:11Z
dc.date.available2026-07-07T11:31:11Z
dc.descriptionWe 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.
dc.description11 pages (Latex), 3 figures (Postscript); updated experimental data included, references added, accepted for publication in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/hep-ph/0112259
dc.identifierhttp://arxiv.org/abs/hep-ph/0112259
dc.identifierPhys.Rev.Lett.89:032001,2002
dc.identifierdoi:10.1103/PhysRevLett.89.032001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197186
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleEvidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data
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