Measurement of gamma(b(b)over-bar)/gamma(had) using impact parameter measurements and lepton identification
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Measurement of gamma(b(b)over-bar)/gamma(had) using impact parameter measurements and lepton identification

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Measurement of gamma(b(b)over-bar)/gamma(had) using impact parameter measurements and lepton identification

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DELPHI Collaboration; Castillo Giménez, María Victoria Perfil; Ferrer Soria, Antonio Perfil; Higón Rodríguez, Emilio Perfil; Chrin, J. T. M.; Cortina Gil, Eduardo; Ferrer Soria, Antonio Perfil; 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; Navas Concha, Sergio; Salt Cairols, José Perfil; Valls Ferrer, Juan Antonio
Aquest document és un/a article, creat/da en: 1995

Este documento está disponible también en : http://dx.doi.org/10.1007/BF01556358
The partial decay width of theZ to bb¯quark pairs has been measured by the DELPHI detector at LEP.b-hadrons, containingb-quarks, were tagged by leptons with high transverse momentum relative to the hadron or by tracks with large impact parameters to the primary vertex.The ratio of the numbers of events with a single such tag to those with two tags was used to estimate the efficiency of the method and to reduce the systematic uncertainty. Combining all methods, the value: Γbb¯Γhad=0.2210±0.0033±0.0003(model)±0.0014(Γcc¯) was found, where the third error corresponds to a±8% uncertainty on the cc production width. A maximum likelihood in to the single and di-lepton distributions gave the branching fraction of the decays ofb-quarks to leptons as: BR(b→l)=(11.06±0.39±0.19(model)±0.12(Γcc¯))%.

    DELPHI Collaboration (Abreu, P. Castillo Giménez, María Victoria Ferrer Soria, Antonio Higón Rodríguez, Emilio 1995 Measurement of gamma(b(b)over-bar)/gamma(had) using impact parameter measurements and lepton identification Zeitschrift für Physik C-Particles and Fields 66 3 323 339
http://dx.doi.org/10.1007/BF01556358
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