Improved measurement of the branching fractions for $J/\psi \to \gamma {\pi }^0$, $\gamma \eta$ and $\gamma {\eta }^{\prime }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +609

Using a data sample of $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ events collected with the BESIII detector, the decays of $J/\psi \to \gamma {\pi }^0(\eta ,{\eta }^{\prime })\to \gamma \gamma \gamma$ are studied. Newly measu…