Study of inclusive J/ψ production in two-photon collisions at LEP II with the DELPHI detector.

DELPHI Collaboration, . and Abdallah, J. and Sopczak, A. and Borrisov, G. , et al. (2003) Study of inclusive J/ψ production in two-photon collisions at LEP II with the DELPHI detector. Physics Letters B, 565. pp. 76-86. ISSN 0370-2693

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Abstract

Inclusive J/ψ production in photon–photon collisions has been observed at LEP II beam energies. A clear signal from the reaction γγ→J/ψ+X is seen. The number of observed N(J/ψ→μ+μ−) events is 36±7 for an integrated luminosity of 617 pb−1, yielding a cross-section of σ(J/ψ+X)=45±9(stat)±17(syst) pb. Based on a study of the event shapes of different types of γγ processes in the PYTHIA program, we conclude that (74±22)% of the observed J/ψ events are due to ‘resolved’ photons, the dominant contribution of which is most probably due to the gluon content of the photon.

Item Type: Journal Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 10540
Deposited By: Users 810 not found.
Deposited On: 17 Jul 2008 10:13
Refereed?: Yes
Published?: Published
Last Modified: 14 Aug 2019 04:00
URI: https://eprints.lancs.ac.uk/id/eprint/10540

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