6533b871fe1ef96bd12d0d10
RESEARCH PRODUCT
Measurement of gamma(b(b)over-bar)/gamma(had) using impact parameter measurements and lepton identification
Delphi CollaborationMaría Victoria Castillo GiménezAntonio Ferrer SoriaEmilio Higón RodríguezJ. T. M. ChrinEduardo Cortina GilAntonio Ferrer SoriaJuan A. Fuster VerdúCarmen García GarcíaJuan José Gómez CadenasJuan José Hernández ReyJosé ÁNgel Hernando MorataCarlos Lacasta LlácerJosé Julio Lozano BahiloFernando Martínez VidalSalvador Martí GarcíaSergio Navas ConchaJosé Salt CairolsJuan Antonio Valls Ferrersubject
High Energy Physics::PhenomenologyHigh Energy Physics::ExperimentPartícules (Física nuclear)Detectors de radiaciódescription
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¯))%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-01-01 |