Measurement of the branching fraction and decay asymmetry of $Λ\to nγ$
BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson et autres
The radiative hyperon decay $Λ\to nγ$ is studied using $(10087\pm44)\times 10^6$ $J/ψ$ events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay $Λ\to nγ$ is determined with a significance of 5.6$σ$ to be $[0.832\pm0.038(\rm stat.)\pm0.054(\rm syst.)]\times10^{-3}$, …
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arXiv (Cornell University)