$\Lambda_{c}^{+}$ decays at BESIII

Abstract

BESIII has made great progress in taking data which is the largest data samples near the $\Lambda_{c}^{+}\bar{\Lambda}_{c}^{-}$ threshold. We have measured the branching fraction of $\Lambda_{c}^{+}\to n\pi^{+}$ to be $(6.6\pm 1.2_{\mathrm{stat.}}\pm 0.4_{\mathrm{syst.}})\times 10^{-4}$ with the statistical significance of 7.3 $\sigma$ firstly using $3.9\mathrm{fb}^{-1}$ $e^{+}e^{-}$ collision collected with BESIII detector at six center-of-mass energies between 4.612 and 4.699 GeV. With the result of the branching fraction of $\Lambda_{c}^{+}\to p\pi^{0}$ from Belle, the ratio of the branching fractions between $\Lambda_{c}^{+}\to n\pi^{+}$ and $\Lambda_{c}^{+}\to p\pi^{0}$ is measured to be larger than 7.2 at 90% confidence level. The branching fractions of $\Lambda_{c}^{+}\to \Lambda \pi^{+}$ and $\Lambda_{c}^{+}\to \Sigma^{0} \pi^{+}$ are measured to be $(1.31\pm 0.08_{\mathrm{stat.}}\pm 0.05_{\mathrm{syst.}})\times 10^{-2}$ and $(1.22\pm 0.08_{\mathrm{stat.}}\pm 0.07_{\mathrm{syst.}})\times 10^{-2}$, respectively, which are consistent with previous BESIII results. More results of $\Lambda_{c}^{+}$ decays will be published with better precision this year using $6.4\mathrm{fb}^{-1}$ $e^{+}e^{-}$ collision data samples between 4.600 and 4.946 GeV.