Measurement of the Λ[superscript 0 over subscript b] lifetime and mass in the ATLAS experiment
Author(s)
Taylor, Frank E.
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A measurement of the Λ[superscript 0 over subscript b] lifetime and mass in the decay channel Λ[superscript 0 over subscript b]→J/ψ(μ[superscript +]μ[superscript -])Λ[superscript 0](pπ[superscript -]) is presented. The analysis uses a signal sample of about 2200 Λ[superscript 0 over subscript b] and Λ̅ [superscript 0 over subscript b] decays that are reconstructed in 4.9 fb[superscript -1] of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Λ[superscript 0 over subscript b] lifetime and mass. They are measured to be τ[subscript Λb]=1.449±0.036(stat)±0.017(syst) ps and mΛb=5619.7±0.7(stat)±1.1(syst) MeV.
Date issued
2013-02Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., T. Abajyan, B. Abbott, et al. Measurement of the Λ[superscript 0 over subscript b] Lifetime and Mass in the ATLAS Experiment. Physical Review D 87(3). © 2013 CERN, for the ATLAS Collaboration
Version: Final published version
ISSN
1550-7998
1089-4918