Measurement of the absolute branching fraction of the three-body decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}{\pi }^0$ and search for ${\Lambda }_c^{+}\to n{K}^{+}{\pi }^0$, ${\Sigma }^0{K}^{+}{\pi }^0$ and $\Lambda K^{+}{\pi }^0$

Abstract

The Cabbibo-favored decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}{\pi }^0$ is studied for the first time using 6.1 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}{\pi }^0$ is measured to be $(7.79\pm 1.46_{}\pm 0.71_{})\times 10^{-3}$, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay ${\Lambda }_c^{+}\to \Xi (1530{)}^0{K}^{+}$ is $(5.99\pm 1.04\pm 0.29)\times 10^{-3}$, which is consistent with the previous result of $(5.02\pm 0.99\pm 0.31)\times 10^{-3}$. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay ${\Lambda }_c^{+}\to n{K}^{+}{\pi }^0$ is $7.1\times 10^{-4}$ at the 90$\%$ confidence level. The upper limits on the branching fractions of ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}{\pi }^0$ and $\Lambda K^{+}{\pi }^0$ are also determined to be $1.8\times 10^{-3}$ and $2.0\times 10^{-3}$, respectively.

arXiv comment15 pages, 20 figures

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Cited by in corpus (2)

• Nonleptonic three-body charmed baryon weak decays with H(15)
• Search for the Cabibbo-suppressed decays ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}{\pi }^0$ and ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}{\pi }^{+}{\pi }^{-}$