Speaker
Description
The BESIII detector accumulated 567 pb$^{-1}$ of data at the center-of-mass energy of 4.6 GeV, which is the world's largest $e^+e^-$ sample at the $\Lambda_c$ pair threshold. By analyzing this data sample, we report the determinations of the absolute branching fractions of the semi-leptonic decays of $\Lambda_c^+ \to \Lambda e^+\nu$ and $\Lambda \mu^+\nu$, the hadronic decays of $\Lambda_c^+ \to pK_s, pK^-\pi^+, pK_s\pi^0, pK_s\pi^+\pi^-, \Lambda \pi^+, \Lambda \pi^+\pi^0, \Lambda \pi^+\pi^+\pi^-, pK^-\pi^+\pi^0, \Sigma^0 \pi^+, \Sigma^+\pi^0, \Sigma^+\pi^+\pi^-, \Sigma^+\omega, nK_s\pi^+, p\pi^+\pi^-, pK^+K^-, p\pi^0, p\eta, \Sigma^-\pi^+\pi^+$ and $\Sigma^-\pi^+\pi^+ \pi^0$, as well as the inclusive $\Lambda$ and electron decays. The accurancies of the absolute branching fractions for most decays are improved significantly compared to the previous measurements. We will aslo report cross section measurement of $e^+e^- \to \Lambda_c^+\Lambda_c^-$ near threshold at BESIII.
