Partial Wave Analysis of $J/\psi \to \gamma (K^{+}{K}^{-}{\pi }^{+}{\pi }^{-})$

J. Z. Bai

BES data on $J/\psi \to \gamma (K^{+}{K}^{-}{\pi }^{+}{\pi }^{-})$ are presented. The $K^{\ast }{\bar{K}}^{\ast }$ contribution peaks strongly near threshold. It is fitted with a broad $0^{-+}$ resonance with mass $M = 1800 \…