Measurement of the φ→π+π− branching ratio |
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| Authors: | I.B. Vasserman L.M. Kurdadze V.A. Sidorov A.N. Skrinsky A.G. Chilingarov Yu.M. Shatunov B.A. Shwartz |
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| Affiliation: | Institute of Nuclear Physics, 630090 Novosibirsk 90, USSR |
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| Abstract: | The branching ratio of the φ→π+π? decay mode Bφππ = (1.9?0.8+1.0) × 10?4 was measured by the interference in the reaction e+e? → π+π?. The interference phase ψ = ?42° ± 13°. The value of χ2 for Bφππ = 0 is 17.8 units larger than that for the optimal Bφππ, e.g.Bφππ = 0 lies outside of the four standard deviation confidence interval. |
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