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

T. Aaltonen et al.
Phys. Rev. D 89, 072014 – Published 22 April 2014

Abstract

We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6fb1 from pp¯ collisions at s=1.96TeV 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/ψμ+μ candidates. First evidence for the process ΩbΩc0π is presented with a significance of 3.3σ. We measure the following baryon masses: M(Ξc0)=2470.85±0.24(stat)±0.55(syst)MeV/c2,M(Ξc+)=2468.00±0.18(stat)±0.51(syst)MeV/c2,M(Λb)=5620.15±0.31(stat)±0.47(syst)MeV/c2,M(Ξb)=5793.4±1.8(stat)±0.7(syst)MeV/c2,M(Ξb0)=5788.7±4.3(stat)±1.4(syst)MeV/c2,andM(Ωb)=6047.5±3.8(stat)±0.6(syst)MeV/c2.The isospin splitting of the Ξb,0 states is found to be M(Ξb)M(Ξb0)=4.7±4.7(stat)±0.7(syst)  MeV/c2. The isospin splitting of the Ξc0,+ states is found to be M(Ξc0)M(Ξc+)=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(Ξb)=1.32±0.14(stat)±0.02(syst)ps,τ(Ωb)=1.660.40+0.53(stat)±0.02(syst)ps.

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  • Received 1 April 2014

DOI:https://doi.org/10.1103/PhysRevD.89.072014

© 2014 American Physical Society

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Vol. 89, Iss. 7 — 1 April 2014

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