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

Abstract

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 $M=1800\pm 100$ MeV, width $\Gamma =500\pm 200$ MeV. A broad $2^{++}$ resonance peaking at 2020 MeV is also required with width $\sim 500$ MeV. There is further evidence for a $2^{-+}$ component peaking at 2.55 GeV. The non-$K^{\ast }{\bar{K}}^{\ast }$ contribution is close to phase space; it peaks at 2.6 GeV and is very different from $K^{\ast }\overline{K^{\ast }}$.

15 pages, 6 figures, 1 table, Submitted to PLB

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