The lifetime of the B0s meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different D-s decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic B0s decays. Two hundred and eight D-sl+ candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured B0s lifetime of τ(B0s) = 1.59 +0.17-0.15 (stat) +/- 0.03 (syst) ps. Using a larger, less constrained sample of events, the product branching ratio is measured to be Br(b -> B0s). Br(B0s -> D-sl+ νX) = 0.82 +/- 0.09 (stat) +0.13-0.14 (syst) %.

Measurement of the Bs0 lifetime and production rate with Ds−ℓ+ combinations in Z decays / D., B., D., C., I., D.B., D., D., P., G., C., G., J. P., L., A., L., M. N., M., P., O., B., P., F., A., M., C., J. M., C., I., E., E., F., M., F.B., V., G., Ll, G., M., M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 361:(1995), pp. 221-233. [10.1016/0370-2693(95)01173-N]

Measurement of the Bs0 lifetime and production rate with Ds−ℓ+ combinations in Z decays

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1995-01-01

Abstract

The lifetime of the B0s meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different D-s decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic B0s decays. Two hundred and eight D-sl+ candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured B0s lifetime of τ(B0s) = 1.59 +0.17-0.15 (stat) +/- 0.03 (syst) ps. Using a larger, less constrained sample of events, the product branching ratio is measured to be Br(b -> B0s). Br(B0s -> D-sl+ νX) = 0.82 +/- 0.09 (stat) +0.13-0.14 (syst) %.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563357
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