Measurements of the branching fractions of ${\Lambda }_c^{+}\to p{\pi }^{-}{\pi }^{+}$, ${\Lambda }_c^{+}\to p{K}^{-}{K}^{+}$, and ${\Lambda }_c^{+}\to p{\pi }^{-}{K}^{+}$

Abstract

The ratios of the branching fractions of the decays ${\Lambda }_c^{+}\to p{\pi }^{-}{\pi }^{+}$, ${\Lambda }_c^{+}\to p{K}^{-}{K}^{+}$, and ${\Lambda }_c^{+}\to p{\pi }^{-}{K}^{+}$ with respect to the Cabibbo-favoured ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ 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${}^{-1}$: \begin{align*} \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} π^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} & = (7.44 \pm 0.08 \pm 0.18)\,\%, \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} K^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} &= (1.70 \pm 0.03 \pm 0.03)\,\%, \frac{\mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} K^{+})}{\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})} & = (0.165 \pm 0.015 \pm 0.005 )\,\%, \end{align*} 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 $\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})$, the corresponding branching fractions are \begin{align*} \mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} π^{+}) &= (4.72 \pm 0.05 \pm 0.11 \pm 0.25) \times 10^{-3}, \mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} K^{+}) &= (1.08 \pm 0.02 \pm 0.02 \pm 0.06) \times 10^{-3}, \mathcal{B}(Λ_{c}^{+} \rightarrow p π^{-} K^{+}) &= (1.04 \pm 0.09 \pm 0.03 \pm 0.05) \times 10^{-4}, \end{align*} where the final uncertainty is due to $\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})$.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-026.html. Addition of supplementary information on selection efficiencies and yield evaluations

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• LHCb Detector Performance
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• Performance of the LHCb RICH detector at the LHC
• Measurements of absolute hadronic branching fractions of ${\Lambda }_c^{+}$ baryon
• Measurement of the Branching Fraction Br(Lambda_c+ -> p K- pi+)
• Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$
• Measurement of the Absolute Branching Fraction for ${\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu }$
• Observation of Cabibbo-suppressed and W-exchange Lambda_c^+ baryon decays
• First Observation of Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: ${\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-}$
• Measurement of Singly Cabibbo Suppressed Decays ${\Lambda }_c^{+}\to p{\pi }^{+}{\pi }^{-}$ and ${\Lambda }_c^{+}\to p{K}^{+}{K}^{-}$
• Multidimensional Resonance Analysis of ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$
• Puzzles in Hyperon, Charm and Beauty Physics

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• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to {\Sigma }^{-}{K}^{+}{\pi }^{+}$