0 Observation of the φ → π + π − π + π − Decay
نویسندگان
چکیده
Using 11.6 pb of data collected in the energy range 0.984–1.06 GeV by CMD-2 at VEPP-2M, the cross section of the reaction e+e− → π+π−π+π− has been studied. For the first time an interference pattern was observed in the energy dependence of the cross section near the φ meson. The branching ratio of the φ → π+π−π+π− decay double suppressed by the G-parity and OZI rule is measured Br(φ → ππππ) = (3.93 ± 1.74 ± 2.14) · 10. The upper limits have been placed for the decays φ → π+π−π+π−π0 and φ → ηπ+π− Br(φ → πππππ) < 4.6 · 10 90%CL, Br(φ → ηππ) < 1.8 · 10 90%CL.
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