Results from a partial-wave analysis of the decay J/ψ→γ${\mathit{K}}_{\mathit{S}}^0$${\mathit{K}}^{\pm }$${\mathrm{\pi }}^{\mp }$ in the ${\mathit{K}}_{\mathit{S}}^0$${\mathit{K}}^{\pm }$${\mathrm{\pi }}^{\mp }$ invariant-mass range 1.35–1.6 GeV/${\mathit{c}}^2$ are presented. Within the isobar model, the data in this mass range are best described by a mixture of $0^{\mathrm{-}+}$ and $1^{++}$ amplitudes, corresponding to the ${\mathit{K}}^{\mathrm{*}}$K¯+c.c (P wave), ${\mathit{K}}^{\mathrm{*}}$K¯+c.c (S wave), and ${\mathit{a}}_0$(980) π (S wave) channels. These results show that η(1430) is not a ${\mathit{J}}^{\mathit{P}\mathit{C}}$=$0^{\mathrm{-}+}$ ${\mathit{a}}_0$(980)π resonance, but a mixture of overlapping states.

• Received 26 June 1990

DOI:https://doi.org/10.1103/PhysRevLett.65.2507