Partial wave analysis of J/ψ → γ(K+K-π+π-)

BES data on J/psi --> gamma(K+K- pi(+)pi(-)) are presented. The K* (K) over bar* contribution peaks strongly near threshold. It is fitted with a broad 0(-+) resonance with mass M = 1800 +/- 100 MeV, width Gamma = 500 +/- 200 MeV. A broad 2(++) resonance peaking at 2020 MeV is also required with width similar to 500 MeV. There is further evidence for a 2(-+) component peaking at 2.55 GeV. The non-K* (K) over bar* contribution is close to phase space; it peaks at 2.6 GeV and is very different from K * K (*) over bar. (C) 2000 Elsevier Science B.V. All rights reserved.