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

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 γγprocesses in the PYTHIA program, we conclude that (74 ± 22)% of the observed J/ψ events are due to 'resolved' photons, t...

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Publication status:
Published

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Journal:
Physics Letters B More from this journal
Volume:
565
Issue:
1-4
Pages:
76-86
Publication date:
2003-07-17
DOI:
ISSN:
0370-2693
Language:
English
Pubs id:
pubs:220965
UUID:
uuid:adae3e65-e3b1-4130-87a1-ac945c94f63e
Local pid:
pubs:220965
Source identifiers:
220965
Deposit date:
2012-12-19

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