Measurements of the branching fractions of $Λ_{c}^{+} \rightarrow
p π^{-} π^{+}$, $Λ_{c}^{+} \rightarrow p K^{-} K^{+}$, and
$Λ_{c}^{+} \rightarrow p π^{-} K^{+}$
p π^{-} π^{+}$, $Λ_{c}^{+} \rightarrow p K^{-} K^{+}$, and
$Λ_{c}^{+} \rightarrow p π^{-} K^{+}$
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Published version
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Author(s)
Type
Journal Article
Abstract
The ratios of the branching fractions of the decays $\Lambda_{c}^{+}
\rightarrow p \pi^{-} \pi^{+}$, $\Lambda_{c}^{+} \rightarrow p K^{-} K^{+}$,
and $\Lambda_{c}^{+} \rightarrow p \pi^{-} K^{+}$ with respect to the
Cabibbo-favoured $\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+}$ 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}(\Lambda_{c}^{+} \rightarrow p \pi^{-}
\pi^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (7.44
\pm 0.08 \pm 0.18)\,\%, \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-}
K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} &= (1.70 \pm
0.03 \pm 0.03)\,\%, \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p \pi^{-}
K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (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
$\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$, the corresponding
branching fractions are \begin{align*} \mathcal{B}(\Lambda_{c}^{+} \rightarrow
p \pi^{-} \pi^{+}) &= (4.72 \pm 0.05 \pm 0.11 \pm 0.25) \times 10^{-3},
\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} K^{+}) &= (1.08 \pm 0.02 \pm
0.02 \pm 0.06) \times 10^{-3}, \mathcal{B}(\Lambda_{c}^{+} \rightarrow p
\pi^{-} K^{+}) &= (1.04 \pm 0.09 \pm 0.03 \pm 0.05) \times 10^{-4},
\end{align*} where the final uncertainty is due to $\mathcal{B}(\Lambda_{c}^{+}
\rightarrow p K^{-} \pi^{+})$.
\rightarrow p \pi^{-} \pi^{+}$, $\Lambda_{c}^{+} \rightarrow p K^{-} K^{+}$,
and $\Lambda_{c}^{+} \rightarrow p \pi^{-} K^{+}$ with respect to the
Cabibbo-favoured $\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+}$ 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}(\Lambda_{c}^{+} \rightarrow p \pi^{-}
\pi^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (7.44
\pm 0.08 \pm 0.18)\,\%, \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-}
K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} &= (1.70 \pm
0.03 \pm 0.03)\,\%, \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p \pi^{-}
K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (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
$\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$, the corresponding
branching fractions are \begin{align*} \mathcal{B}(\Lambda_{c}^{+} \rightarrow
p \pi^{-} \pi^{+}) &= (4.72 \pm 0.05 \pm 0.11 \pm 0.25) \times 10^{-3},
\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} K^{+}) &= (1.08 \pm 0.02 \pm
0.02 \pm 0.06) \times 10^{-3}, \mathcal{B}(\Lambda_{c}^{+} \rightarrow p
\pi^{-} K^{+}) &= (1.04 \pm 0.09 \pm 0.03 \pm 0.05) \times 10^{-4},
\end{align*} where the final uncertainty is due to $\mathcal{B}(\Lambda_{c}^{+}
\rightarrow p K^{-} \pi^{+})$.
Date Issued
2018-03
Date Acceptance
2018-02-12
Citation
Journal of High Energy Physics, 2018, 2018 (3)
ISSN
1029-8479
Publisher
Springer Verlag (Germany)
Journal / Book Title
Journal of High Energy Physics
Volume
2018
Issue
3
Copyright Statement
© 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0 - https://creativecommons.org/licenses/by/4.0/), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Identifier
http://dx.doi.org/10.1007/JHEP03(2018)043
Subjects
hep-ex
hep-ex
Notes
All 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
Publication Status
Published
Article Number
43
Date Publish Online
2018-03-08