Consistent Treatment of Axions in the Weak Chiral Lagrangian.

Consistent Treatment of Axions in the Weak Chiral Lagrangian.
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弱手性拉格朗日中轴子的一致处理。

DOI:
10.1103/physrevlett.127.081803
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发表时间:
2021
影响因子:
8.6
通讯作者:
A. Thamm
A. Thamm
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
M. Bauer;M. Neubert;S. Renner;Marvin Schnubel;A. Thamm

文献摘要

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我们在有效的手性拉格朗日量的背景下提出了涉及轴子或类轴子粒子的弱衰变的一致实现。我们认为,以前对此类过程的处理使用了手性理论中风味变化夸克流的错误表示。作为一个应用,我们推导了手性展开式中前导阶的 K^{-}→π^{-}a 和 π^{-}→e^{-}ν[over ¯]_{e}a 的衰减以及任意轴子耦合和质量的与模型无关的结果。特别是,我们发现 K^{-}→π^{-}a 分支比几乎比之前估计的大 40 倍。
We present a consistent implementation of weak decays involving an axion or axionlike particle in the context of an effective chiral Lagrangian. We argue that previous treatments of such processes have used an incorrect representation of the flavor-changing quark currents in the chiral theory. As an application, we derive model-independent results for the decays K^{-}→π^{-}a and π^{-}→e^{-}ν[over ¯]_{e}a at leading order in the chiral expansion and for arbitrary axion couplings and mass. In particular, we find that the K^{-}→π^{-}a branching ratio is almost 40 times larger than previously estimated.