Measurement of the Λ b 0 lifetime in the decay Λ b 0 → J/ψΛ 0 with the D0 detector

Nenhuma Miniatura disponível

Data

2005-03-18

Autores

Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Agelou, M.
Agram, J. L.
Ahn, S. H.
Ahsan, M.

Título da Revista

ISSN da Revista

Título de Volume

Editor

Resumo

We present measurements of the Λ b 0 lifetime in the exclusive decay channel Λ b 0 → J/ψΛ 0with J/ψ → μ +μ - and Λ 0 → pπ -, the B 0 lifetime in the decay B 0 → J/ψ/K s 0 with J/ ψ → μ + μ - and K s 0 → π + π -, and the ratio of these lifetimes. The analysis is based on approximately 250 pb -1 of data recorded with the D0 detector in pp̄ collisions at √s = 1.96 TeV. The Λ b 0 lifetime is determined to be τ(Λ b 0) = 1.22 -0.18 +0.22(stat) ± 0.04(syst) ps, the B 0 lifetime τ(B 0) = 1.40 -0.10 0.11(stat) ± 0.03(syst) ps, and the ratio τ(Λ b 0)/ τ(B 0) = 0.87- 0.14 0.17(stat) ± 0.03(syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Λ b 0 lifetime based on a fully reconstructed decay channel. © 2005 The American Physical Society.

Descrição

Palavras-chave

Como citar

Physical Review Letters, v. 94, n. 10, 2005.