Observation of the doubly strange b baryon Omega_b-

Abstract

We report the observation of the doubly strange b baryon Omega_b- in the decay channel Omega_b- to J/psi Omega-, with J/psi to mu+ mu- and Omega- to Lambda K-, in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ 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.

v2: As published in Phys. Rev. Letters

References in corpus (3)

• Bottom Baryons
• Direct observation of the strange b baryon Xi_b^{-}
• Model-Independent Bottom Baryon Mass Predictions in the 1/N Expansion

Cited by in corpus (5)

• Bottom baryons from a dynamical lattice QCD simulation
• Excitations of single-beauty hadrons
• Analysis of ${\Omega }_b^{-}(bss)$ and ${\Omega }_c^0(css)$ with QCD sum rules
• Tree Level Semileptonic ${\Sigma }_b$ to Nucleon Decay in Light Cone QCD Sum Rules
• Spectroscopy of Hadrons with b Quarks