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29 March 2024
 
  » arxiv » hep-ex/0307049

 Article overview


Study of Inclusive J/psi Production in Two-Photon Collisions at LEP II with the DELPHI Detector
The DELPHI Collaboration ; J. Abdallah ; et al ;
Date 17 Jul 2003
Journal Phys.Lett. B565 (2003) 76-86
Subject hep-ex
AbstractInclusive J/psi production in photon-photon collisions has been observed at LEP II beam energies. A clear signal from the reaction gamma gamma -> J/psi+X is seen. The number of observed N(J/psi -> mu+mu-) events is 36 +/- 7 for an integrated luminosity of 617 pb^{-1}, yielding a cross-section of sigma(J/psi+X) = 45 +/- 9 (stat) +/- 17 (syst) pb. Based on a study of the event shapes of different types of gamma gamma processes in the PYTHIA program, we conclude that (74 +/- 22)% of the observed J/psi events are due to `resolved’ photons, the dominant contribution of which is most probably due to the gluon content of the photon.
Source arXiv, hep-ex/0307049
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