ar X iv : h ep - e x / 04 11 00 1 v 1 2 9 O ct 2 00 4 Resonances in J / ψ → φπ + π − and φK + K −
نویسندگان
چکیده
A partial wave analysis is presented of J/ψ → φππ and φKK from a sample of 58M J/ψ events in the BES II detector. The f0(980) is observed clearly in both sets of data, and parameters of the Flatté formula are determined accurately:M = 965± 8 (stat) ±6 (syst) MeV/c, g1 = 165± 10± 15 MeV/c, g2/g1 = 4.21± 0.25± 0.21. The φππ data also exhibit a strong ππ peak centred at M = 1335 MeV/c. It may be fitted with f2(1270) and a dominant 0 + signal made from f0(1370) interfering with a smaller f0(1500) component. There is evidence that the f0(1370) signal is resonant, from interference with f2(1270). There is also a state in ππ with M = 1790 −30 MeV/c 2 and Γ = 270 −30 MeV/c ; spin 0 is preferred over spin 2. This state, f0(1790), is distinct from f0(1710). The φKK̄ data contain a strong peak due to f ′ 2(1525). A shoulder on its upper side may be fitted by interference between f0(1500) and f0(1710). PACS: 13.25.Gv, 14.40.Gx, 13.40.Hq
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