Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}$ and ${\Sigma }^{+}{K}_S^0$

Abstract

Based on a sample of 4.4 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays ${\Lambda }_c^{+}\to {\Sigma }^0{K}^{+}$ and ${\Lambda }_c^{+}\to {\Sigma }^{+}{K}_S^0$ are studied. The ratio of the branching fraction $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^0{K}^{+})$ relative to $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^0{\pi }^{+})$ is measured to be $0.0361\pm 0.0073(stat.)\pm 0.0005(syst.)$, and the ratio of $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{K}_S^0)$ relative to $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\pi }^{+}{\pi }^{-})$ is measured to be $0.0106\pm 0.0031(stat.)\pm 0.0004(syst.)$. After taking the world-average branching fractions of the reference decay channels, the branching fractions $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^0{K}^{+})$ and $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{K}_S^0)$ are determined to be $(4.7\pm 0.9(stat.)\pm 0.1(syst.)\pm 0.3(ref.))\times 10^{-4}$ and $(4.8\pm 1.4(stat.)\pm 0.2(syst.)\pm 0.3(ref.))\times 10^{-4}$, respectively. The branching fraction of the ${\Lambda }_c^{+}\to {\Sigma }^{+}{K}_S^0$ decay is measured for the first time.

arXiv comment13 pages, 4 figures

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• Measurement of Branching Fractions for ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}$ and ${\Lambda }_c^{+}\to n{K}_S^0{K}^{+}$
• Prospects for $P$ and $CP$ violation in ${\Lambda }_c^{+}$ decays with polarized beam at Super Tau-Charm Facility