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Measurement of the production fraction times branching fraction f(b -> Lambda(b)) . B(Lambda(b) -> J/psi Lambda)
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2011 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 84, no 3, 031102- p.Article in journal (Refereed) Published
Abstract [en]

The Lambda(b)(udb) baryon is observed in the decay Lambda(b) -> J/psi Lambda using 6.1fb(-1) of p (p) over bar collisions collected with the D0 detector at root s = 1/96 TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B(0) -> J/psi K(s)(0) is measured to be 0.345 +/- 0.034(stat) +/- 0.033(syst) +/- 0.003(PDG). Using the world average value of f(b -> B(0)) . B(B(0) -> J/psi K(s)(0) = (1.74 +/- 0.08) x 10(-5), we obtain f(b -> Lambda(b)) . B(Lambda(b) -> J/psi Lambda) = (6.01 +/- 0.60(stat) +/- 0.58(syst) +/- 0.28(PDG)) x 10(-5). This measurement represents an improvement in precision by about a factor of 3 with respect to the current world average.

Place, publisher, year, edition, pages
2011. Vol. 84, no 3, 031102- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-157242DOI: 10.1103/PhysRevD.84.031102ISI: 000293556300001OAI: oai:DiVA.org:uu-157242DiVA: diva2:437964
Available from: 2011-08-31 Created: 2011-08-22 Last updated: 2017-12-08Bibliographically approved

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