Study of Inclusive J/psi Production in Two-Photon Collisions at LEP II with the DELPHI Detector
| dc.creator | The DELPHI Collaboration | |
| dc.creator | Abdallah, J. | |
| dc.date | 2003-07-17 | |
| dc.date.accessioned | 2026-07-07T12:02:00Z | |
| dc.date.available | 2026-07-07T12:02:00Z | |
| dc.description | Inclusive 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. | |
| dc.description | 13 pages, 8 figures, Accepted by Phys. Lett. B | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0307049 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0307049 | |
| dc.identifier | Phys.Lett.B565:76-86,2003 | |
| dc.identifier | doi:10.1016/S0370-2693(03)00660-9 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/207292 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Study of Inclusive J/psi Production in Two-Photon Collisions at LEP II with the DELPHI Detector | |
| dc.type | text |