Observation of the decay Λb0 → χc1

The LHCb collaboration

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The Cabibbo-suppressed decay Λb0→ χc1 is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λb0→ χc2 decay is also found. Using the Λb0→ χc1pK decay as normalisation channel, the ratios of branching fractions are measured to beB(Λb0→χc1pπ−)B(Λb0→χc1pK−)=(6.59±1.01±0.22)×10−2,B(Λb0→χc2pπ−)B(Λb0→χc1pπ−)=0.95±0.30±0.04±0.04,B(Λb0→χc2pK−)B(Λb0→χc1pK−)=1.06±0.05±0.04±0.04, where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2→ J/ψγ decays. [Figure not available: see fulltext.]

Original languageEnglish
Article number95
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - May 2021


  • B physics
  • Branching fraction
  • Hadron-Hadron scattering (experiments)
  • QCD
  • Quarkonium

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