The Jψ→γ${\pi }^{+}$${\pi }^{-}$${\pi }^{+}$${\pi }^{-}$ and J/ψ→γ${\mathrm{\pi }}^{+}$${\mathrm{\pi }}^{\mathrm{-}}$${\mathrm{\pi }}^0$${\mathrm{\pi }}^0$ decays have been studied by the DM2 experiment from 8.6×${10}^6$ J/ψ’s. Both decays exhibit a large pseudoscalar ρρ dynamics. Three $J^{\mathrm{PC}}$${=0\mathrm{}}^{\mathrm{-}+}$ resonant states (more than 3500 events, globally) decaying into ${\rho }^0$${\rho }^0$ and with less statistical significance into ${\rho }^{+}$${\rho }^{\mathrm{-}}$ are observed. Their branching ratios into ${\rho }^0$${\rho }^0$ and ${\rho }^{+}$${\rho }^{\mathrm{-}}$ support an $I^G$${=0\mathrm{}}^{+}$ assignment. These states, named η(1500), η(1800), and η(2100), are not associated with well-established resonances.

• Received 30 June 1988

DOI:https://doi.org/10.1103/PhysRevD.39.701