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首页> 外文期刊>Physics of atomic nuclei >Investigation of near-threshold eta-meson production in the reaction π ~-p→ ηn
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Investigation of near-threshold eta-meson production in the reaction π ~-p→ ηn

机译：反应π〜-p→ηn中近阈等位介子产生的研究

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Differential and total cross sections for eta-meson production in the reaction π ~-p → ηn were measured within the experimental program eta-meson physics implemented in the pion channel of the synchrocyclotron of the Petersburg Nuclear Physics Institute (PNPI, Gatchina). These measurements were performed at incident-pion momenta (700, 710, 720, and 730 MeV/c) in the vicinity of the threshold for the process under study by using the neutral-meson spectrometer designed and created at the Meson Physics Laboratory of PNPI. It is shown that, in the immediate vicinity of the threshold (685 MeV/c), the process of eta-meson production proceeds predominantly via S _(11)(1535)-resonance formation followed by the decay S _(11)(1535) → ηn (the respective branching fraction is Br ≈ 60%), but that, as the momentum of incident pions increases, the role of the D wave becomes ever more important. A detailed analysis of this effect indicates that it is due to the increasing contribution of the D _(13)(1520) resonance. Although the branching fraction of the decay of this resonance through the ηn channel is assumed to be very small (BR ≈ 0.24%), the effect is enhanced owing to the interference between the D wave and the dominant resonance S _(11)(1535).
机译：在反应π〜-p→ηn中产生η-介子的微分截面和总截面是在彼得斯堡核物理研究所同步回旋加速器（PNPI，Gatchina）的π通道中实施的η-介子物理实验程序中测量的。这些测量是使用PNPI介子物理实验室设计和制造的中性-介子谱仪在研究过程的阈值附近以入射小动量矩（700、710、720和730 MeV / c）进行的。结果表明，在阈值（685 MeV / c）的附近，eta介子产生过程主要通过S _（11）（1535）-共振形成，随后是衰变S _（11）（ 1535）→ηn（各自的分支分数为Br≈60％），但是随着入射小子的动量增加，D波的作用变得越来越重要。对这种影响的详细分析表明，这是由于D _（13）（1520）共振的贡献增加所致。尽管假定该谐振通过ηn通道的衰减的分支分数很小（BR≈0.24％），但由于D波和主导谐振S _（11）（1535）之间的干扰，效果得到了增强）。

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