Using about 1.5 million hadronic Z decays recorded with the ALEPH detector, the lifetime of the b baryons has been measured using two independent data samples. From a maximum likelihood fit to the impact parameter distribution of leptons in 519 Lambda l(-) combinations containing a b baryon sample of 290 decays, the measured b baryon lifetime is tau(b-baryon) = 1.05(-0.11)(+0.12)(stat) +/-0.09(syst) ps. The lifetime of the Lambda(b)(0) baryon from a maximum likelihood fit to the proper time distribution of 58 Lambda(c)(+)l(-) candidates containing a Lambda(b)(0) sample of 44 decays, is tau(Lambda(b)(0)) = 1.02(-0.18)(+0.23)(stat) +/- 0.06(syst) ps.

D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). Measurements of the b baryon Lifetime. PHYSICS LETTERS. SECTION B, 357(4), 685-698 [10.1016/0370-2693(95)00980-Y].

Measurements of the b baryon Lifetime

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1995-01-01

Abstract

Using about 1.5 million hadronic Z decays recorded with the ALEPH detector, the lifetime of the b baryons has been measured using two independent data samples. From a maximum likelihood fit to the impact parameter distribution of leptons in 519 Lambda l(-) combinations containing a b baryon sample of 290 decays, the measured b baryon lifetime is tau(b-baryon) = 1.05(-0.11)(+0.12)(stat) +/-0.09(syst) ps. The lifetime of the Lambda(b)(0) baryon from a maximum likelihood fit to the proper time distribution of 58 Lambda(c)(+)l(-) candidates containing a Lambda(b)(0) sample of 44 decays, is tau(Lambda(b)(0)) = 1.02(-0.18)(+0.23)(stat) +/- 0.06(syst) ps.
1995
D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). Measurements of the b baryon Lifetime. PHYSICS LETTERS. SECTION B, 357(4), 685-698 [10.1016/0370-2693(95)00980-Y].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37575
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