Flavor probes of axion-like particles
Flavor probes of axion-like particles
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DOI：
10.1007/jhep09(2022)056
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发表时间：
2021-10
影响因子：
5.4
通讯作者：
M. Bauer;M. Neubert;S. Renner;Marvin Schnubel;A. Thamm
中科院分区：
文献类型：
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作者：
M. Bauer;M. Neubert;S. Renner;Marvin Schnubel;A. Thamm
轴子和类轴子粒子（ALP）是标准模型（SM）高能扩展的低能遗迹。我们调查的ALP与变味耦合的现象学，并提出了一个全面的分析夸克和轻子变味观测在一般ALP有效场论。研究的观测量包括稀有介子衰变，中性介子的味振荡，稀有轻子衰变和偶极矩。我们推导出的一般ALP耦合作为其质量的函数的界限，始终考虑到ALP的寿命和分支比。我们进一步计算了夸克的变味效应，这些效应是由新的物理尺度和测量尺度之间的运行和匹配引起的。这使我们能够获得基准ALP模型的界限，其中只有一个单一的（无味或风味通用）ALP耦合到SM粒子是目前在新的物理尺度，在这种情况下，我们强调的互补性和竞争力的风味边界与来自对撞机，束流收集器和天体物理测量的约束。我们发现，搜索在介子衰变产生的ALP提供了一些最强的限制MeV-GeV的质量范围内，即使是最无味的ALP模型。同样，我们讨论的相互作用的风味保存和风味违反耦合的ALP轻子，发现轻子风味违反观测的约束一般强烈依赖于两者。此外，我们分析了ALP是否可以提供各种实验异常，包括在罕见的B介子衰变，测量在ATOMKI和KTeV实验中观察到的，以及在μ子和电子的异常磁矩的解释。
Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model (SM). We investigate the phenomenology of an ALP with flavor-changing couplings, and present a comprehensive analysis of quark and lepton flavor-changing observables within a general ALP effective field theory. Observables studied include rare meson decays, flavor oscillations of neutral mesons, rare lepton decays, and dipole moments. We derive bounds on the general ALP couplings as a function of its mass, consistently taking into account the ALP lifetime and branching ratios. We further calculate quark flavor-changing effects that are unavoidably induced by running and matching between the new physics scale and the scale of the measurements. This allows us to derive bounds on benchmark ALP models in which only a single (flavorless or flavor-universal) ALP coupling to SM particles is present at the new physics scale, and in this context we highlight the complementarity and competitiveness of flavor bounds with constraints derived from collider, beam dump and astrophysical measurements. We find that searches for ALPs produced in meson decays provide some of the strongest constraints in the MeV-GeV mass range, even for the most flavorless of ALP models. Likewise, we discuss the interplay of flavor-conserving and flavor-violating couplings of the ALP to leptons, finding that constraints from lepton flavor-violating observables generally depend strongly on both. Additionally, we analyze whether an ALP can provide an explanation for various experimental anomalies including those observed in rare B-meson decays, measurements at the ATOMKI and KTeV experiments, and in the anomalous magnetic moments of the muon and the electron.