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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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2005 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 94, no 10, 102001- p.Article in journal (Refereed) Published
Abstract [en]

We present measurements of the Lambda(b)(0) lifetime in the exclusive decay channel Lambda(b)(0)-> J/psi Lambda(0), with J/psi ->mu(+)mu(-) and Lambda(0)-> p pi(-), the B-0 lifetime in the decay B-0-> J/psi K-S(0) with J/psi ->mu(+)mu(-) and K-S(0)->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 p (p) over bar collisions at root s = 1.96 TeV. The Lambda(b)(0) lifetime is determined to be tau(Lambda(b)(0))=1.22(-0.18)(+0.22)(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(b)(0))/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(b)(0) lifetime based on a fully reconstructed decay channel.

Place, publisher, year, edition, pages
2005. Vol. 94, no 10, 102001- p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-37771DOI: 10.1103/PhysRevLett.94.102001ISI: 000227838900015ScopusID: 2-s2.0-18044394204OAI: diva2:435187
Available from: 2011-08-17 Created: 2011-08-17 Last updated: 2012-02-02Bibliographically approved

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Clément, ChristopheStrandberg, Jonas
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