Speaker
Description
The BESIII experiment is a symmetric e+e- collider operating at c.m. energy from 2.0 to 4.95 GeV. With the world’s largest threshold production data set of J/ψ (10 billion), ψ(3686) (2.6 billion), and 20 $fb^{-1}$ of D meson pairs from ψ((3770) decay, we are able to search for various dark sector particles produced in e+e- annihilation and meson decay processes. In this talk, we report the search for $K_S$ invisible decay, the search for the massless dark photon with charm FCNC process $D^0\to \omega\gamma’$ and $D^0 \to \gamma \gamma’$, the search for the dark baryon decay in $\Xi \to \pi^- + invisible$, the search for $J/\psi \to \Phi + invisible$, and the search for $X(17)$ with $\Psi(3686)\to X(17) \chi_c^0$, and $\Psi(3686) \to \gamma\chi_c^0 \to \gamma X(17)J/\Psi$.
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