Mass and lifetime measurements of bottom and charm baryons in p p ̄ collisions at s =1.96TeV MASS and LIFETIME MEASUREMENTS of BOTTOM and ⋯ T. AALTONEN

We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 fb−1 from pp¯ collisions at ffiffi s p ¼ 1.96 TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect J=ψ → μþμ− candidates. First evidence for the process Ω− b → Ω0 cπ− is presented with a significance of 3.3σ. We measure the following baryon masses:M(Ξ0c)=2470.85±0.24(stat)±0.55(syst)  MeV/c2,M(Ξ+c)=2468.00±0.18(stat)±0.51(syst)  MeV/c2,M(Λb)=5620.15±0.31(stat)±0.47(syst)  MeV/c2,M(Ξ−b)=5793.4±1.8(stat)±0.7(syst)  MeV/c2,M(Ξ0b)=5788.7±4.3(stat)±1.4(syst)  MeV/c2,andM(Ω−b)=6047.5±3.8(stat)±0.6(syst)  MeV/c2. The isospin splitting of the Ξ−,0b states is found to be M(Ξ−b)−M(Ξ0b)=4.7±4.7(stat)±0.7(syst)  MeV/c2. The isospin splitting of the Ξ0,+c states is found to be M(Ξ0c)−M(Ξ+c)=2.85±0.30(stat)±0.04(syst)  MeV/c2.