Observation of the helicity-selection-rule suppressed decay of the ${\chi }_{c2}$ charmonium state

BESIII Collaboration, M. Ablikim, M. N. Achasov +424

The decays of ${\chi }_{c2}\to K^{+}{K}^{-}{\pi }^0$, $K_S{K}^{\pm }{\pi }^{\mp }$ and ${\pi }^{+}{\pi }^{-}{\pi }^0$ are studied with the $\psi (3686)$ data samples collected with the Beijing Spectrometer (BESIII)…