Evidence for a bottom baryon resonance Λ[*0 over b] in CDF data
Author(s)Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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Using data from proton-antiproton collisions at s√ = 1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, evidence for the excited resonance state Λ[*0 over b] is presented in its Λ[0 over b]π[superscript −]π[superscript +] decay followed by the Λ[0 over b] → Λ[+ over c]π[superscript −] and Λ[+ over c] → pK[superscript −]π[superscript +] decays. The analysis is based on a data sample corresponding to an integrated luminosity of 9.6 fb[superscript −1] 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 3.5σ. The mass of the observed state is found to be 5919.22 ± 0.76 MeV/c[superscript 2] in agreement with similar findings in proton-proton collision experiments.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society
Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Evidence for a bottom baryon resonance Λ[*0 over b] in CDF data.” Physical Review D 88, no. 7 (October 2013). © 2013 American Physical Society
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