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

AuthorsAaltonen, T.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vilar, Rocío ; Vizán, J. ; CDF Collaboration
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review D 89: 072014 (2014)
AbstractWe report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6fb-1 from pp̄ 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/ ψ→μ+μ- candidates. First evidence for the process Ωb-→Ωc0π- 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-)=1.66-0.40+0.53(stat)±0.02(syst)ps. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.89.072014
Identifiersdoi: 10.1103/PhysRevD.89.072014
e-issn: 1550-2368
issn: 1550-7998
Appears in Collections:(IFCA) Artículos
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