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J / psi production in the hadronic decays of the Z

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J / psi production in the hadronic decays of the Z

dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Cases Ruiz, Ramón
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Chrin, J. T. M.
dc.contributor.author	Fez Laso, M. D. M. de
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Hernando Morata, José Ángel
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.date.accessioned	2014-05-06T09:37:01Z
dc.date.available	2014-05-06T09:37:01Z
dc.date.issued	1994
dc.identifier.uri	http://hdl.handle.net/10550/34917
dc.description.abstract	J/ψ mesons have been reconstructed from their decay to μ+μ− and e+e−, using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 ± 17 J/ψ were found, 5.4 ± 2.3 ψ′ were obtained in the channel J/ψ (→μ+μ−)π+π− and 6.4 ± 2.7 χc in the channel J/ψ ( → μ+μ−)γ. As the dominant source of Jψ mesons is from bquarks, the following branching ratios: Br(b → J/ψX) = (1.12 ± 0.12 (stat) ± 0.10 (syst.))%, Br(b → ψ′ X) = (0.48 ± 0.22 (stat.± 0.10 (syst.))%, Br(b → χc1X) = (1.4 ± 0.6 (stat.)−0.2+0.4 (syst.))% were measured. From the proper time distribution of the J/ψ sample, the average lifetime of b-hadrons decaying into J/ψ was found to be: τB = 1.50−0.21+0.24 (stat.) ± 0.03 (syst.) ps. A search for completely reconstructed B meson decays to final states including a J/ψ gave a signal of 15 ± 5 events.
dc.relation.ispartof	Physics Letters B, 1994, vol. 341, num. 1, p. 109-122
dc.source	DELPHI collaboration Castillo Giménez, María Victoria Cases Ruiz, Manuel Ramón Ferrer Soria, Antonio Higón Rodríguez, Emilio 1994 J / psi production in the hadronic decays of the Z Physics Letters B 341 1 109 122
dc.subject	Partícules (Física nuclear)
dc.title	J / psi production in the hadronic decays of the Z
dc.type	journal article	es_ES
dc.date.updated	2014-05-06T09:37:01Z
dc.identifier.doi	http://dx.doi.org/10.1016/0370-2693(94)01385-3
dc.identifier.idgrec	006560
dc.rights.accessRights	open access	es_ES