The $K_S^0{K}_S^0{\pi }^0$ system produced in ${\pi }^{-}p$ interactions at 21.4 GeV/c

The $K_S^0{K}_S^0{\pi }^0$ systems, a pure $C=+1\mathrm{}$ state, has been studied in the reaction ${\pi }^{-}p\to K_S^0{K}_S^0{\pi }^{0}n$ at 21.4 GeV/c. The $K_S^0{K}_S^0{\pi }^0$ spectrum is significantly different from the $K\overline{K}\pi$ distribution observed in other lower-energy peripheral hadroproduction experiments. In addition to production of the $f_1\mathrm{}\left(1285\right)\mathrm{}$, evidence for production of the $\eta \mathrm{}\left(1460\right)\mathrm{}$ [sometimes called the $\iota \mathrm{}\left(1460\right)\mathrm{}$] based on mass spectra and a Dalitz-plot spin-parity analysis is reported. The narrower, lower-mass state observed in other $K\overline{K}\pi$ experiments is observed weakly if at all in this experiment. Hadronic production of the $\eta \mathrm{}\left(1460\right)\mathrm{}$, which is a good glueball candidate because of its presence in $\frac{J}{\psi }$ radiative decay, suggests possible mixing with the $q\overline{q}$ sector.