J / psi production in the hadronic decays of the Z

J / psi production in the hadronic decays of the Z

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J / psi production in the hadronic decays of the Z

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DELPHI Collaboration; Higón Rodríguez, Emilio Perfil; Cases Ruiz, Ramón; Castillo Giménez, María Victoria Perfil; Ferrer Soria, Antonio Perfil; Cortina Gil, Eduardo; Chrin, J. T. M.; Fez Laso, M. D. M. de; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gómez Cadenas, Juan José Perfil; Hernández Rey, Juan José Perfil; Hernando Morata, José Ángel; Lacasta Llácer, Carlos; Lozano Bahilo, José Julio; Martínez Vidal, Fernando Perfil; Martí García, Salvador; Salt Cairols, José Perfil; Valls Ferrer, Juan Antonio
This document is a artículoDate1994

Este documento está disponible también en : http://hdl.handle.net/10550/34917
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.

    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

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