par Abreu, Pedro;Lefebure, Véronique ;Tomaradze, A.;Van Doninck, Walter;Van Lysebetten, Ann;Verbeure, F;Wickens, John H. ;Alderweireld, Thomas;Bertrand, Daniel ;Deghorain, A.;De Brabandere, S.;De Clercq, Catherine;Herquet, P. ;Hoorelbeke, S.;Huet, Kathy; [et al.]
Référence European Physical Journal C. Particles and Fields, 10, 3, page (415-442)
Publication Publié, 1999
Référence European Physical Journal C. Particles and Fields, 10, 3, page (415-442)
Publication Publié, 1999
Article révisé par les pairs
Résumé : | The partial decay width of the Z to bb̄ quark pairs has been measured by the DELPHI detector at LEP using data taken in the years 1992 to 1995. Decays of b-hadrons were tagged by several methods using tracks with large impact parameters and/or reconstructed secondary vertices, complemented by event shape variables. Combining these methods in a multivariate analysis the value Γ(Z → bb̄)/Γ(Z → had) = 0.21634 ± 0.00067 (stat) ± 0.00060 (syst) was obtained, where the cc̄ production fraction was fixed to its Standard Model value. |