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# 中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

Aug 8 – 12, 2022
Asia/Shanghai timezone

## Search for invisible decays and rare decays at BESIII

Aug 10, 2022, 9:30 AM
15m
Oral report 强子物理与味物理

### Description

BESIII has collected 2.5 B $\psi(2S)$ events and 10 B $J/\psi$ events. The huge data sample provide an excellent chance to search for new physics in charmonium decays. We report the search for the decay $J/\psi\to\gamma + invisible$ and a potential light Higgs A0 in radiative J/psi decay. We also search for the J/psi rare weak decay to $D^-e^+\nu_e +c.c.$, and present the most stringent constraints of $10^{-6}$ at 90\% confidence level. The huge J/psi data set also produce lots of hyperon events at BESIII, which allow us to search for the rare decay of hyperon, such as the invisible decay of Lambda, \Xi semi-leptonic decay. The FCNC process for D0->pi0 vv is also search with the near threshold D0 events at BESIII.