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Measurement of the Bs0 lifetime and production rate with Ds−ℓ+ combinations in Z decays
Physics Letters B
The lifetime of the B 0 s meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven dierent D s decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic B 0 s decays. Two h undred and eight D s + candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured B 0 s lifetime of (B 0 s ) = 1 : 59 +0:17 0:15 (stat) 0:03 (syst) p s :doi:10.1016/0370-2693(95)01173-n fatcat:chydxzw3azerlk2n3rmx2gopf4