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

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 co...

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Detalles Bibliográficos
Autores principales: Klasen, M, Kniehl, Bernd A, Mihaila, L N, Steinhauser, M
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.89.032001
http://cds.cern.ch/record/532221
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author Klasen, M
Kniehl, Bernd A
Mihaila, L N
Steinhauser, M
author_facet Klasen, M
Kniehl, Bernd A
Mihaila, L N
Steinhauser, M
author_sort Klasen, M
collection CERN
description 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.
id cern-532221
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
record_format invenio
spelling cern-5322212019-09-30T06:29:59Zdoi:10.1103/PhysRevLett.89.032001http://cds.cern.ch/record/532221engKlasen, MKniehl, Bernd AMihaila, L NSteinhauser, MEvidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X DataParticle Physics - PhenomenologyWe 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.hep-ph/0112259DESY-2001-202DESY-01-202oai:cds.cern.ch:5322212001-12-19
spellingShingle Particle Physics - Phenomenology
Klasen, M
Kniehl, Bernd A
Mihaila, L N
Steinhauser, M
Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title_full Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title_fullStr Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title_full_unstemmed Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title_short Evidence for Colour-Octet Mechanism from CERN LEP2 $\gamma \gamma \to J/\psi$ + X Data
title_sort evidence for colour-octet mechanism from cern lep2 $\gamma \gamma \to j/\psi$ + x data
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevLett.89.032001
http://cds.cern.ch/record/532221
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AT kniehlbernda evidenceforcolouroctetmechanismfromcernlep2gammagammatojpsixdata
AT mihailaln evidenceforcolouroctetmechanismfromcernlep2gammagammatojpsixdata
AT steinhauserm evidenceforcolouroctetmechanismfromcernlep2gammagammatojpsixdata

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