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Observation of the Doubly Strange b Baryon Omega(-)(b)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 23, 232002- p.Article in journal (Refereed) Published
Abstract [en]

We report the observation of the doubly strange b baryon Omega(-)(b) in the decay channel Omega(-)(b) -> J/psi Omega(-), with J/psi -> mu(+)mu(-) and Omega(-) -> Lambda K- -> (p pi(-))K-, in p (p) over bar collisions at root s = 1.96 TeV. Using approximately 1.3 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8 +/- 4.9(stat) +/- 0.8(syst) Omega(-)(b) signal events at a mass of 6.165 +/- 0.010(stat) +/- 0.013(syst) GeV. The significance of the observed signal is 5.4 sigma, corresponding to a probability of 6.7 x 10(-8) of it arising from a background fluctuation.

Place, publisher, year, edition, pages
2008. Vol. 101, no 23, 232002- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-107007DOI: 10.1103/PhysRevLett.101.232002ISI: 000261431200015PubMedID: 19113541OAI: oai:DiVA.org:uu-107007DiVA: diva2:227554
Note

D0 Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.101.232002

Available from: 2009-07-15 Created: 2009-07-15 Last updated: 2017-12-13Bibliographically approved

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