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

Abstract BES data on J / ψ → γ ( π + π − π + π − ) have been analyzed into partial waves. We fit with resonances having J PC =2 ++ at 1275 MeV, 0 ++ at 1500 MeV, 2 ++ at 1565 MeV, 0 ++ at 1740 MeV, 2 ++ at 1940 MeV and 0 ++ at 2104 MeV, plus a broad 0 − component. The 0 ++ resonances decay dominantly to σσ , while 2 ++ resonances in the high mass region decay mainly to f 2 (1270) σ and σσ ; 2 ++ resonances from the low mass region decay dominantly to ρρ .