Observation of the Doubly Strange b Baryon Ωb-
Abstract
We report the observation of the doubly strange b baryon Ωb- in the decay channel Ωb-→J/ψΩ-, with J/ψ→μ+μ- and Ω-→ΛK-→(pπ-)K-, in p pmacr collisions at s=1.96TeV. Using approximately 1.3fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8±4.9(stat)±0.8(syst) Ωb- signal events at a mass of 6.165±0.010(stat)±0.013(syst)GeV. The significance of the observed signal is 5.4σ, corresponding to a probability of 6.7×10-8 of it arising from a background fluctuation.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2008
- DOI:
- 10.1103/PhysRevLett.101.232002
- arXiv:
- arXiv:0808.4142
- Bibcode:
- 2008PhRvL.101w2002A
- Keywords:
-
- 14.20.Mr;
- 14.65.Fy;
- Bottom baryons;
- Bottom quarks;
- High Energy Physics - Experiment
- E-Print:
- v2: As published in Phys. Rev. Letters