Evidence for a bottom baryon resonance Lambda_b* in CDF data

Aaltonen, T.;Vizan Garcia, Jesús Manuel;The CDF Collaboration;et.al.
(2013) Physical Review. D, Particles, Fields, Gravitation and Cosmology — Vol. 88, n° 7, p. 71101 (2013)

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  • Aaltonen, T.
    Author
  • Vizan Garcia, Jesús ManuelUCLouvain
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  • The CDF Collaboration
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  • et. al.
Abstract
Using data from proton-antiproton collisions at Ecms=1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, evidence for the excited resonance state Lambda_b* is presented in its Lambda_b0 pi+ pi- decay, followed by the Lambda_b0 -->Lambda_c+ (-->proton K- pi+) pi- decays. The analysis is based on a data sample corresponding to an integrated luminosity of 9.6/fb collected by an online event selection based on charged-particle tracks displaced from the proton-antiproton interaction point. The significance of the observed signal is 3.5 Gaussian sigmas. The mass of the observed state is found to be 5919.22 +- 0.76 MeV in agreement with similar findings in proton-proton collision experiments.
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Aaltonen, T., Vizan Garcia, J. M., The CDF Collaboration, & et al. (2013). Evidence for a bottom baryon resonance Lambda_b* in CDF data. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 88(7), 71101. https://doi.org/10.1103/PhysRevD.88.071101 (Original work published 2013)