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Direct observation of the strange b baryon Xi(-)(b)
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 99, no 5, 052001-1-052001-8 p.Article in journal (Refereed) Published
Abstract [en]

We report the first direct observation of the strange b baryon Xi(-)(b)(Xi) over bar (+)(b)). We reconstruct the decay Xi(-)(b)-->J/psi Xi(-), with J/psi-->mu(+)mu(-), and Xi(-)-->Lambda pi(-)-->p pi(-)pi(-) in p (p) over bar collisions at root s = 1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(-)(b) candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psi Lambda, we measure the relative rate sigma(Xi(-)(b))xB(Xi(-)(b)-->J/psi Xi)/ sigma(Lambda(b))xB(Lambda(b)-->J/psi Lambda) = 0.28 +/- 0.09(stat)(-0.08)(+0.09)(syst).

Place, publisher, year, edition, pages
2007. Vol. 99, no 5, 052001-1-052001-8 p.
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Subatomic Physics
URN: urn:nbn:se:kth:diva-35492DOI: 10.1103/PhysRevLett.99.052001ISI: 000248597500012ScopusID: 2-s2.0-34547679498OAI: diva2:428803
QC 20110701Available from: 2011-07-01 Created: 2011-07-01 Last updated: 2011-07-01Bibliographically approved

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Clément, ChristopheGollub, NilsHansson, PerStrandberg, Jonas
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Particle and Astroparticle Physics
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