par Abreu, Pedro;Bertrand, Daniel 
;Bricman, Charles ;Cao, Futian;Chen, Max;Deghorain, A.;De Brabandere, S.;De Clercq, Catherine;Herquet, Philippe ;Hoorelbeke, S.;Huet, Kathy;Lefebure, Véronique ;Lemonne, Jacques ;Tomaradze, A.;Vander Velde, Catherine ;Van Doninck, Walter;Verbeure, F;Wickens, John H. ; [et al.]
Référence European Physical Journal C. Particles and Fields, 71, 1, page (199-210)
Publication Publié, 2011
;Bricman, Charles ;Cao, Futian;Chen, Max;Deghorain, A.;De Brabandere, S.;De Clercq, Catherine;Herquet, Philippe ;Hoorelbeke, S.;Huet, Kathy;Lefebure, Véronique ;Lemonne, Jacques ;Tomaradze, A.;Vander Velde, Catherine ;Van Doninck, Walter;Verbeure, F;Wickens, John H. ; [et al.]Référence European Physical Journal C. Particles and Fields, 71, 1, page (199-210)
Publication Publié, 2011
Article révisé par les pairs
| Résumé : | The average lifetime of b-baryons has been studied using 3 × 106 hadronic Z0 decays collected by the DEL-PHI detector at LEP. Three methods have been used, based on the measurement of different observables: the proper decay time distribution of 206 vertices reconstructed with a A, a lepton and an oppositely charged pion; the impact parameter distribution of 441 muons with high transverse momentum accompanied by a A in the same jet; and the proper decay time distribution of 125 A0-lepton decay vertices with the A, exclusively reconstructed through its pKπ, pK0 and A3π decay modes. The combined result is:, where the first systematic error is due to experimental uncertainties and the second to the uncertainties in the modelling of the b-baryon production and semi-leptonic decay. Including the measurement recently published by DELPHI based on a sample of proton-muon vertices, the average b-baryon lifetime is T (b-baryon) = (1.255+0.115-0.102(stat)0102 ± 0.05) ps. © Springer-Verlag 1996. |
