Measurement of the hyperon weak radiative decay ${\Xi }^0\to \gamma {\Sigma }^0$ at BESIII

BESIII Collaboration, M. Ablikim, M. N. Achasov +615

The hyperon weak radiative decay ${\Xi }^0\to \gamma {\Sigma }^0$ is measured via the process $J/\psi \to {\Xi }^0{\bar{\Xi }}^0$. The absolute branching fraction of ${\Xi }^0\to \gamma {\Sigma }^0$ is determined to be $(3.69\pm 0.21_{\t…