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

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 4.2fb-1 of data from pp̄ collisions at s=1.96TeV, 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...

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Publisher copy:
10.1103/PhysRevD.80.072003

Authors


Journal:
Physical Review D
Volume:
80
Issue:
7
Publication date:
2009-10-06
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
Language:
English
Pubs id:
pubs:106092
UUID:
uuid:1d92606e-6857-4c99-8804-8fdfa7ca59d2
Local pid:
pubs:106092
Source identifiers:
106092
Deposit date:
2012-12-19

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