# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Search for invisible decays at BESIII

26 Jul 2021, 14:15
15m
Zoom

#### Zoom

Parallel session talk Searches for New Physics

### Speaker

Xiaodong Shi (Shandong University)

### Description

BESIII has collected 448.2 M $\psi(3686)$ data set and 10 B $J/\psi$ data set. The huge clean data sample provide an excellent chance to search for new physics. We report the search for decay $J/\psi\to\gamma + invisible$, which is predicted by next-to-minimal supersymmetric model. Without significant signal found, we gave around 6.2 times better upper limits than previous CLEO-c’s results. In addition, we report the preliminary result of the first search for the invisible decay of $\Lambda$. This invisible decay is predicted by the mirror matter model which could explain the $4\sigma$ discrepancy in neutron lifetime measurement results from the beam method and bottle method.

Collaboration / Activity BESIII

### Primary author

Xiaodong Shi (Shandong University)