MEASUREMENT OF LAMBDA-B PRODUCTION AND LIFETIME IN Z0 HADRONIC DECAYS

MEASUREMENT OF LAMBDA-B PRODUCTION AND LIFETIME IN Z0 HADRONIC DECAYS

Evidence for the production of b-flavoured baryons in Z0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by the Z0 are Λb, the observed signal of (Λl- + Λ̄l+) pairs, where l is a...

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Dettagli Bibliografici
Autori principali: Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, R, Alekseev, G, Algeri, A, Allen, P, Almehed, S, Alvsvaag, S, Amaldi, U, Andreazza, A, Antilogus, P, Apel, W, Apsimon, R, Arnoud, Y, Asman, B, Augustin, J, Augustinus, A, Baillon, P, Bambade, P, Barao, F, Barate, R, Barbiellini, G
Natura: Journal article
Lingua:English
Pubblicazione: 1993
Descrizione
Riassunto:Evidence for the production of b-flavoured baryons in Z0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by the Z0 are Λb, the observed signal of (Λl- + Λ̄l+) pairs, where l is a high transverse momentum lepton in the same jet as the Λ, leads to a production rate: f (b → Λb) x Br(Λb → Λlv X) = (0.41±0.13± 0.09)%. Using a sample of 18 reconstructed Λb decay vertices, the lifetime is determined to be τ(Λb) = (1.04-0.38+0.48±0.10) ps.

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