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, the dominant contribution of which is most probably due to the gluon content of the photon. © 2003 Published by Elsevier B.V.

Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alderweireld, T., et al. (2003). Study of inclusive J/ψ production in two-photon collisions at LEP II with the DELPHI detector. PHYSICS LETTERS. SECTION B, 565(1-4), 76-86 [10.1016/S0370-2693(03)00660-9].

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

CALVI, MARTA;PAGANONI, MARCO;TABARELLI DE FATIS, TOMMASO;TERRANOVA, FRANCESCO;
2003

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, the dominant contribution of which is most probably due to the gluon content of the photon. © 2003 Published by Elsevier B.V.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
2003
565
1-4
76
86
none
Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alderweireld, T., et al. (2003). Study of inclusive J/ψ production in two-photon collisions at LEP II with the DELPHI detector. PHYSICS LETTERS. SECTION B, 565(1-4), 76-86 [10.1016/S0370-2693(03)00660-9].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/155975
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