Measurement of the branching fraction and decay asymmetry of $\Lambda \to n\gamma$

BESIII Collaboration, M. Ablikim, M. N. Achasov +565

The radiative hyperon decay $\Lambda \to n\gamma$ is studied using $(10087\pm 44)\times 10^6$ $J/\psi$ events collected with the BESIII detector operating at BEPCII. The absolute branching fractio…