Search for an axion-like particle in radiative $J/\psi$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +588

We search for an axion-like particle (ALP) $a$ through the process $\psi (3686)\to {\pi }^{+}{\pi }^{-}J/\psi$, $J/\psi \to \gamma a$, $a\to \gamma \gamma$ in a data sample of $(2.71\pm 0.01)\times 10^9$…