Measurement of the Lambda^0_b lifetime in the decay Lambda^0_b -> J/psi Lambda^0 with the D0 Detector

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dc.creatorD0 Collaboration
dc.creatorAbazov, V. M.
dc.date2004-10-19
dc.date2004-10-21
dc.date.accessioned2026-07-07T11:57:57Z
dc.date.available2026-07-07T11:57:57Z
dc.descriptionWe present measurements of the Lambda^0_b lifetime in the exclusive decay channel Lambda^0_{b}->J/psi Lambda^0, with J/psi to mu+ mu- and Lambda^0 to p pi-, the B^0 lifetime in the decay B^0 -> J/psi K^0_S with J/psi to mu+ mu- and K^0_S to pi+ pi-, and the ratio of these lifetimes. The analysis is based on approximately 250 pb^{-1} of data recorded with the D0 detector in pp(bar) collisions at sqrt{s}=1.96 TeV. The Lambda^0_b lifetime is determined to be tau(Lambda^0_b) = 1.22 +0.22/-0.18 (stat) +/- 0.04 (syst) ps, the B^0 lifetime tau(B^0) = 1.40 +0.11/-0.10 (stat) +/- 0.03 (syst) ps, and the ratio tau(Lambda^0_b)/tau(B^0) = 0.87 +0.17/-0.14 (stat) +/- 0.03 (syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Lambda^0_b lifetime based on a fully reconstructed decay channel.
dc.description7 pages, 4 figures, Submitted to Physical Review Letters, v2: Added FNAL Pub-number
dc.identifierhttps://arxiv.org/abs/hep-ex/0410054
dc.identifierhttp://arxiv.org/abs/hep-ex/0410054
dc.identifierPhys.Rev.Lett.94:102001,2005
dc.identifierdoi:10.1103/PhysRevLett.94.102001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206062
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of the Lambda^0_b lifetime in the decay Lambda^0_b -> J/psi Lambda^0 with the D0 Detector
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