Partial wave analysis of J / psi to gamma (pi+ pi- pi+ pi-)

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 .

14.40.Cs
12.39.Mk
13.25.Jx
13.40.Hq
electron positron: colliding beams
electron positron: annihilation
J/psi(3100): electroproduction
J/psi(3100): radiative decay
J/psi(3100): branching ratio
partial wave analysis

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