Speaker
Description
The BESIII experiment has collected 2.6 billion $\psi(3686)$ events, 10 billion $J/\psi$ events, 20 $fb^{-1}$ of D meson pairs at 3.773 GeV, and 7.33 $fb^{-1}$ of $D_sD_s^*$ events from 4.128 to 4.226 GeV. These huge data samples allow us to search for rare processes in charm hadron decays.
In this talk, we report the search of the FCNC decays $J/\psi \to D^0 \mu^+ \mu^-$ and $D_s^+ \to h(h')e^+ e^-$. The searches for $J/\psi$ weak decays containing a D meson and for $J/\psi \to \gamma D^0$ will also be presented.
In addition, we will introduce the search for baryon number violation via $\Lambda-\bar{\Lambda}$ oscillation in $J/\psi \to \Lambda \bar{\Lambda}$ decay, and the search for lepton number violation processes $D_s^+ \to h^-h^0e^+e^+$ and $\phi \to \pi^+\pi^+e^-e^-$.
