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Dispersive construction of two-loop P→πππ(P=K,η) amplitudes

机译:双环P→πππ(p = k,η)幅度的分散结构

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We present and develop a general dispersive framework allowing us to construct representations of the amplitudes for the processes P π → π π , P = K , η , valid at the two-loop level in the low-energy expansion. The construction proceeds through a two-step iteration, starting from the tree-level amplitudes and their S and P partial-wave projections. The one-loop amplitudes are obtained for all possible configurations of pion masses. The second iteration is presented in detail in the cases where either all masses of charged and neutral pions are equal or for the decay into three neutral pions. Issues related to analyticity properties of the amplitudes and of their lowest partial-wave projections are given particular attention. This study is introduced by a brief survey of the situation, for both experimental and theoretical aspects, of the decay modes into three pions of charged and neutral kaons and of the eta meson.
机译:我们呈现并开发一般的分散框架,允许我们构建过程Pπ→ππ,p = k,η,在低能量扩展中的两个环路电平有效的幅度的表示。 施工通过从树级振幅及其S和P部分波预测开始的两步迭代进行。 为所有可能的π脉冲配置获得单环幅度。 在所有带电和中性接头等于或腐蚀到三个中性接头的情况下,在其中详细介绍了第二次迭代。 特别注意,与幅度和最低部分波突起的分析性质相关的问题。 本研究通过对腐烂模式的实验和理论方面的情况进行了简短的调查,将腐烂模式分为三个带电和中性的卡在和ETA Meson。

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