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Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b)-> J/psi Lambda
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 14, 142001- p.Article in journal (Refereed) Published
Abstract [en]

We have measured the Lambda(b) lifetime using the exclusive decay Lambda(b)-> J/psi Lambda, based on 1.2 fb(-1) of data collected with the D0 detector during 2002-2006. From 171 reconstructed Lambda(b) decays, where the J/psi and Lambda are identified via the decays J/psi ->mu(+)mu(-) and Lambda -> p pi, we measured the Lambda(b) lifetime to be tau(Lambda(b))=1.218(-0.115)(+0.130)(stat)+/- 0.042(syst) ps. We also measured the B-0 lifetime in the decay B-0 -> J/psi(mu(+)mu(-))K-S(0)(pi(+)pi(-)) to be tau(B-0)=1.501(-0.074)(+0.078)(stat)+/- 0.050(syst) ps, yielding a lifetime ratio of tau(Lambda(b))/tau(B-0)=0.811(-0.087)(+0.096)(stat)+/- 0.034(syst).

Place, publisher, year, edition, pages
2007. Vol. 99, no 14, 142001- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-143142DOI: 10.1103/PhysRevLett.99.142001ISI: 000249974000013OAI: oai:DiVA.org:uu-143142DiVA: diva2:389406
Available from: 2011-01-19 Created: 2011-01-19 Last updated: 2017-12-11Bibliographically approved

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High Energy PhysicsDepartment of Nuclear and Particle PhysicsUppsala University
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