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

Journal article

We present measurements of the Λ b0 lifetime in the exclusive decay channel Λ b0 → J/ψΛ 0with J/ψ → μ +μ - and Λ 0 → pπ -, the B 0 lifetime in the decay B 0 → J/ψ/K s0 with J/ ψ → μ + μ - and K s0 → 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 b0 lifetime is determined to be τ(Λ b0) = 1.22 -0.18+0.22(stat) ± 0.04(syst) ps, the B 0 lifetime τ(B 0) = 1.40 -0.100.11(stat) ± 0.03(syst) ps, and the ratio τ(Λ b0)/ τ(B 0) = 0.87- 0.140.17(stat) ± 0.03(syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Λ b0 lifetime based on a fully reconstructed decay channel. © 2005 The American Physical Society.

Authors: Abazov, V; Abbott, B; Abolins, M; Acharya, B; Adams, M

• Journal: Physical Review Letters
• Volume: 94
• Issue: 10
• Publication date: 2005-03-18
• DOI: 10.1103/PhysRevLett.94.102001
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English