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Observation of the Ωb- baryon and measurement of the properties of the Ξb- and Ωb- baryons

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dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Helsinki Institute of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Helsinki Institute of Physics (HIP) (-2009) en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author Aaltonen, Timo
dc.contributor.author Mehtala, P.
dc.contributor.author Orava, R.
dc.contributor.author Maki, T.
dc.contributor.author Saarikko, H.
dc.contributor.author Osterberg, K.
dc.contributor.author CDF collaboration
dc.date.accessioned 2011-01-04T22:06:35Z
dc.date.available 2011-01-04T22:06:35Z
dc.date.issued 2009
dc.identifier.citation Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H , Osterberg , K & CDF collaboration 2009 , ' Observation of the Ωb- baryon and measurement of the properties of the Ξb- and Ωb- baryons ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol 80 , no. 7 , pp. 072003 . en
dc.identifier.issn 1550-7998
dc.identifier.other PURE: 9378000
dc.identifier.other ArXiv: http://arxiv.org/abs/0905.3123v2
dc.identifier.uri http://hdl.handle.net/10138/24454
dc.description.abstract We report the observation of the bottom, doubly-strange baryon Ωb- through the decay chain Ωb-→J/ψΩ-, where J/ψ→μ+μ-, Ω-→ΛK-, and Λ→pπ-, using 4.2  fb-1 of data from pp̅ collisions at √s=1.96  TeV, and recorded with the Collider Detector at Fermilab. A signal is observed whose probability of arising from a background fluctuation is 4.0×10-8, or 5.5 Gaussian standard deviations. The Ωb- mass is measured to be 6054.4±6.8(stat)±0.9(syst)  MeV/c2. The lifetime of the Ωb- baryon is measured to be 1.13-0.40+0.53(stat)±0.02(syst)  ps. In addition, for the Ξb- baryon we measure a mass of 5790.9±2.6(stat)±0.8(syst)  MeV/c2 and a lifetime of 1.56-0.25+0.27(stat)±0.02(syst)  ps. Under the assumption that the Ξb- and Ωb- are produced with similar kinematic distributions to the Λb0 baryon, we find σ(Ξb-)B(Ξb-→J/ψΞ-)/σ(Λb0)B(Λb0→J/ψΛ)=0.167-0.025+0.037(stat)±0.012(syst) and σ(Ωb-)B(Ωb-→J/ψΩ-)/σ(Λb0)B(Λb0→J/ψΛ)=0.045-0.012+0.017(stat)± 0.004(syst) for baryons produced with transverse momentum in the range of 6–20  GeV/c. en
dc.format.extent 16
dc.language.iso eng
dc.publisher American Physical Society
dc.relation.ispartof Physical Review D : Particles, Fields, Gravitation and Cosmology
dc.relation.uri http://prd.aps.org/pdf/PRD/v80/i7/e072003
dc.subject 114 Physical sciences en
dc.subject hep-ex en
dc.title Observation of the Ωb- baryon and measurement of the properties of the Ξb- and Ωb- baryons en
dc.title.alternative Observation of the Omega_b^- and Measurement of the Properties of the Xi_b^- and Omega_b^- en
dc.type A1 Refereed journal article
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.80.072003
dc.type.dcmitype document
dc.type.uri info:eu-repo/semantics/article

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