Two-photon decays of π~0, η and η'

B. Borasoy; R. NiBler

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Two-photon decays of π~0, η and η'

机译：π〜0，η和η'的双光子衰减

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摘要

We investigate the decays of π~0, η and η' into two photons in an effective U(3) chiral Lagrangian approach without employing large-N_c arguments. Tree level and one-loop contributions from the anomalous Wess-Zumino-Witten Lagrangian are calculated and the importance of η-η' mixing is discussed. Unitarity corrections beyond one loop play an important role for the decays with off-shell photons and are included by employing a coupled-channel Bethe-Salpeter equation which satisfies unitarity constraints and generates vector mesons from composed states of two pseudoscalar mesons.

机译：我们在不使用大N_c参数的情况下，在有效的U（3）手性拉格朗日方法中研究了π〜0，η和η'到两个光子的衰减。计算了异常Wess-Zumino-Witten Lagrangian的树水平和单环贡献，并讨论了η-η'混合的重要性。一个循环以外的统一性校正对于壳外光子的衰变起着重要作用，并通过采用满足统一性约束并从两个伪标量介子的合成态生成矢量介子的耦合通道Bethe-Salpeter方程包括在内。

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《The European Physical Journal, A. Hadrons and Nuclei》 |2004年第3期|共16页
作者
B. Borasoy; R. NiBler;
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正文语种 eng
中图分类原子核物理学;
关键词
chiral Lagrangians; electromagnetic decays;

机译：手性拉格朗日;电磁衰变;

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Two-photon decays of π~0, η and η'

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