Observations of the Cabibbo-Suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, $n{\pi }^{+}{\pi }^{-}{\pi }^{+}$ and the Cabibbo-Favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$

Abstract

Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 ${\mathrm{fb}}^{-1}$, collected by the BESIII detector in the energy region between $4600$ MeV and $4699$ MeV, we report the first observations of the Cabibbo-suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^{-}{\pi }^{+}$, and the Cabibbo-favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$ with statistical significances of $7.9\sigma$, $7.8\sigma$, and $>10\sigma$, respectively. The branching fractions of these decays are measured to be $\mathcal{B}({\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0)=(0.64\pm 0.09\pm 0.02)\%$, $\mathcal{B}({\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^{-}{\pi }^{+})=(0.45\pm 0.07\pm 0.03)\%$, and $\mathcal{B}({\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+})=(1.90\pm 0.08\pm 0.09)\%$, where the first uncertainties are statistical and the second are systematic. We find that the branching fraction of the decay ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$ is about one order of magnitude higher than that of ${\Lambda }_c^{+}\to n{\pi }^{+}$.

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Cited by in corpus (10)

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• First Measurement of the Decay Asymmetry in the pure W-boson-exchange Decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$
• Observation of a rare beta decay of the charmed baryon with a Graph Neural Network
• Anatomy of ${\Lambda }_c^{+}$ semileptonic decays
• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• Measurement of the absolute branching fraction of the inclusive decay ${\bar{\Lambda }}_c^{-}\to \bar{n}+X$
• Measurement of Branching Fractions for ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}$ and ${\Lambda }_c^{+}\to n{K}_S^0{K}^{+}$
• First observation of the decay ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}{\pi }^0$
• Baryons and baryoniums in the perspective of QCD sum rules
• Evidence for the semileptonic decays ${\Lambda }_c^{+}\to {\Sigma }^{\pm }{\pi }^{\mp }{e}^{+}{\nu }_e$