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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; Ferrer Soria, Antonio; Higón Rodríguez, Emilio; Chrin, J. T. M.; Cortina Gil, Eduardo; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gómez Cadenas, Juan José; Hernández Rey, Juan José; Hernando Morata, José Ángel; Lacasta Llácer, Carlos; Lozano Bahilo, José Julio; Martínez Vidal, Fernando; Martí García, Salvador; Navas Concha, Sergio; Salt Cairols, José; Valls Ferrer, Juan Antonio

Aquest document és un/a article, creat/da en: 1995

Este documento está disponible también en : 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¯))%.

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