${{\boldsymbol a}_{{0}}{(1950)}}$ $I^G(J^{PC})$ = $1^-(0^{+ +})$
Needs confirmation. Seen in ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ by
LEES 2016A with significance 2.5 $\sigma $ in ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ and 4.2 $\sigma $ in ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ .