Hidden gauge formalism for the radiative decays of axial-vector mesons
Hidden gauge formalism for the radiative decays of axial-vector mesons
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DOI：
10.1103/physrevd.79.014015
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发表时间：
2008-09
影响因子：
5
通讯作者：
H. Nagahiro;L. Roca;A. Hosaka;E. Oset
中科院分区：
文献类型：
--
作者：
H. Nagahiro;L. Roca;A. Hosaka;E. Oset
利用由隐规范对称性（HGS）形式得到的矢量介子拉格朗日量，研究了轴矢量共振辐射衰变为赝标介子和光子的过程。形式主义是非常适合于研究这个问题，因为它处理了赝标和矢量介子在一个统一的方式，尊重手征不变性。我们明确地显示了规范不变性的一组图表中出现的方法和评估的辐射衰减宽度的a{sub 1}（1260）和B{sub 1}（1235）轴矢量介子共振到{pi}{gamma}。我们还包括涉及异常耦合回路的贡献，并将结果与以前在另一种形式主义中获得的结果进行比较。
The radiative decay of the axial-vector resonances into a pseudoscalar meson and a photon is studied using the vector meson Lagrangian obtained from the hidden gauge symmetry (HGS) formalism. The formalism is well suited to study this problem since it deals with pseudoscalar and vector mesons in a unified way, respecting chiral invariance. We show explicitly the gauge invariance of the set of diagrams that appear in the approach and evaluate the radiative decay width of the a{sub 1}(1260) and b{sub 1}(1235) axial-vector meson resonances into {pi}{gamma}. We also include the contribution of loops involving anomalous couplings and compare the results to those obtained previously within another formalism.