Search for the f 1 (1285) → π + π - π 0 decay with the VES detector

V. Dorofeev, R. Dzhelyadin, A. Ekimov,Yu. Gavrilov,Yu. Gouz, A. Ivashin, V. Kabachenko, I. Kachaev,A. Karyukhin,Yu. Khokhlov, V. Konstantinov, M. Makouski, V. Matveev, A. Myagkov,V. Nikolaenko, A. Ostankov, B. Polyakov, D. Ryabchikov, N. Shalanda, M. Soldatov,A. A. Solodkov,A. V. Solodkov, O. Solovianov,E. Starchenko, A. Zaitsev

The European Physical Journal A（2008）

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摘要

The isospin-violating decay f 1 (1285) → π + π - π 0 has been studied at the VES facility. This study is based on the statistics acquired in π - Be interactions at 27, 36.6 and 41 GeV/ c in the diffractive reaction π - N → ( f 1 π - ) N . The f 1 (1285) → π + π - π 0 decay is observed. The preliminary ratio of decay probabilities BR ( f 1 (1285) → π + π - π 0 ) to BR ( f 1 (1285) → ηπ + π - ) . BR (η → γγ) is ∼ 2% .

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关键词

14.40.Cs Other mesons with S = C = 0,mass < 2.5 GeV,13.25.Jx Decays of other mesons,12.39.Fe Chiral Lagrangians

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