Measurements of the branching fractions of Λc+ → pπ−π+, Λc+ → pK−K+, and Λc+ → pπ−K+

LHCb Collaboration

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The ratios of the branching fractions of the decays Λ c +  → π+, Λ c +  → pKK+, and Λ c +  → K+ with respect to the Cabibbo-favoured Λ c +  → pKπ+ decay are measured using proton-proton collision data collected with the LHCb experiment at a 7 TeV centre-of-mass energy and corresponding to an integrated luminosity of 1.0 fb−1: B(Λ+c→pπ−π+)B(Λ+c→pK−π+)=(7.44±0.08±0.18)%,B(Λ+c→pK−K+)B(Λ+c→pK−π+)=(1.70±0.03±0.03)%B(Λ+c→pπ−K+)B(Λ+c→pK−π+)=(0.165±0.015±0.005)%, where the uncertainties are statistical and systematic, respectively. These results are the most precise measurements of these quantities to date. When multiplied by the world-average value for B(Λ+c→pK−π+), the corresponding branching fractions are B(Λ+c→pπ−π+)=(4.72±0.05±0.11±0.25)×10−3,B(Λ+c→pK−K+)=(1.08±0.02±0.02±0.06)×10−3,B(Λ+c→pπ−K+)=(1.04±0.09±0.03±0.05)×10−4, where the final uncertainty is due to B(Λ+c→pK−π+).
Original languageEnglish
Article number43
Number of pages23
JournalJournal of High Energy Physics
Early online date8 Mar 2018
Publication statusPublished - Mar 2018


  • Branching fraction
  • Charm physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • Spectroscopy


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