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 b0) = 1.02(-0.18)(+0.23)(stat) +/- 0.06(syst) ps.

Measurements of the b baryon lifetime / Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Minard, M.n., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.m., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Gaitan, V., Garrido, L., Martinez, M., Orteu, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 357:4(1995), pp. 685-698. [10.1016/0370-2693(95)00980-Y]

Measurements of the b baryon lifetime

CREANZA, Donato Maria;GELAO, Gennaro;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1995

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 b0) = 1.02(-0.18)(+0.23)(stat) +/- 0.06(syst) ps.
1995
Measurements of the b baryon lifetime / Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Minard, M.n., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.m., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Gaitan, V., Garrido, L., Martinez, M., Orteu, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 357:4(1995), pp. 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/11589/1421
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