The low-energy effective theory of axions and ALPs
The low-energy effective theory of axions and ALPs
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DOI：
10.1007/jhep04(2021)063
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发表时间：
2021-04-08
影响因子：
5.4
通讯作者：
Thamm, Andrea
中科院分区：
文献类型：
--
作者：
Bauer, Martin;Neubert, Matthias;Thamm, Andrea
轴子和类轴子粒子（ALPs）是标准模型高能扩展的良好激发的低能遗迹，它们通过被新物理领域的质量尺度λ抑制的高维算子与已知粒子相互作用。从最一般的5维相互作用出发，我们详细讨论了ALP耦合从新物理尺度到电弱对称性破缺尺度及以下能量的演化。我们在规范耦合的双环阶和汤川相互作用的单环阶下推导了相关的异常维数，并仔细考虑了涉及ALP耦合到希格斯电流的冗余算子的处理。我们考虑了弱尺度下的单环（部分双环）匹配贡献，包括特别的风味变化效应。详细讨论了有效拉格朗日的不同等价形式之间的关系。我们还构造了与光子和光伪标量介子相互作用的ALP的有效手性拉格朗日量，指出了与QCD轴子的相应拉格朗日量的重要区别。
Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Lambda of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.