Title
Observation of the <tex>$\Omega_{b}^{-}$</tex> baryon and measurement of the properties of the <tex>$\Xi_{b}^{-}$</tex> and <tex>$\Omega_{b}^{-}$</tex> baryons Observation of the <tex>$\Omega_{b}^{-}$</tex> baryon and measurement of the properties of the <tex>$\Xi_{b}^{-}$</tex> and <tex>$\Omega_{b}^{-}$</tex> baryons
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
Volume/pages
80(2009) :7 , p. 072003,1-072003,16
ISSN
0556-2821
ISI
000271353400011
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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 pp&#773; 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 620  GeV/c.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/233900/96ff42c2.pdf
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