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dc.date.accessioned 2019-08-28T13:35:05Z
dc.date.available 2019-08-28T13:35:05Z
dc.date.issued 1999-08-19
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/79983
dc.description.abstract The two-photon width Γγγ of the ηc meson has been measured with the L3 detector at LEP. The ηc is studied in the decay modes π+π−π+π−, π+π−K+K−, K0sK±π∓, K+K−π0, π+π−η, π+π−η′, and ρ+ρ− using an integrated luminosity of 140 pb−1 at √s≃91 GeV and of 52 pb−1 at √s ≃ 183 GeV. The result is Γγγ (ηc)=6.9±1.7 stat ± 0.8 sys ± 2.0(BR) keV. The Q2 dependence of the ηc cross section is studied for Q2 < 9 GeV2. It is found to be better described by a Vector Meson Dominance model form factor with a J-pole than with a ρ-pole. In addition, a signal of 29±11 events is observed at the χc0 mass. Upper limits for the two-photon widths of the χc0, χc2, and η′c are also given. en
dc.format.extent 155-166 es
dc.language en es
dc.subject L3 detector es
dc.subject Fotones es
dc.subject large electron positron collider es
dc.title Formation of the ηc in two-photon collisions at LEP en
dc.type Articulo es
sedici.identifier.other https://doi.org/10.1016/S0370-2693(99)00784-4
sedici.identifier.issn 0370-2693 es
sedici.creator.person Dova, María Teresa es
sedici.creator.person L3 Collaboration es
sedici.subject.materias Ciencias Exactas es
sedici.subject.materias Física es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Physics Letters B es
sedici.relation.journalVolumeAndIssue vol. 461, no. 1-2 es


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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Excepto donde se diga explícitamente, este item se publica bajo la siguiente licencia Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)