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 s√=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→μ+μ− candidates. First evidence for the process Ω−b→Ω0cπ− 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. The following lifetime measurements are made: τ(Λb)=1.565±0.035(stat)±0.020(syst)ps,τ(Ξ−b)=1.32±0.14(stat)±0.02(syst)ps,τ(Ω−b)=1.66+0.53−0.40(stat)±0.02(syst)ps.

Mass and lifetime measurements of bottom and charm baryons in pp¯ collisions at √s=1.96 TeV

Cauz D.;Santi L.;
2014-01-01

Abstract

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 s√=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→μ+μ− candidates. First evidence for the process Ω−b→Ω0cπ− 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. The following lifetime measurements are made: τ(Λb)=1.565±0.035(stat)±0.020(syst)ps,τ(Ξ−b)=1.32±0.14(stat)±0.02(syst)ps,τ(Ω−b)=1.66+0.53−0.40(stat)±0.02(syst)ps.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/983552
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