缪子衰变跨尺度：从LEFT到SMEFT
Muon decay across scales: from LEFT to SMEFT
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中文总结 AI 辅助
本文在LEFT框架下研究缪子衰变，推导维数五和六算符对可观测量的影响，通过拟合数据并映射到SMEFT，约束单场和双场扩展，发现轻子数破坏情形下中微子质量约束更强。
中文摘要 AI 辅助
我们在低能有效场论（LEFT）框架内重新审视精密缪子衰变，考虑LEFT如何扰动总衰变率以及标准米歇尔参数和依赖极化的米歇尔参数。我们推导了这些可观测量对维数为五和六的LEFT算符的依赖关系，包括破坏轻子数算符，并允许任意的中微子味分配。我们考虑对缪子衰变数据的LEFT拟合，特别是采用一种不遵循LEFT幂次计数的中微子味广义拟合方法，并假设新物理以相同强度耦合到所有味，从而允许一致的拟合。随后，我们考虑新物理在SMEFT及后续LEFT中的印记，以约束单场扩展的特定情形以及两个有动机的双场扩展情形。虽然我们推断这些情形的相关质量标度在数百GeV到多TeV范围，但我们也发现，对于轻子数破坏的具体情况，来自算符混合的中微子质量约束比缪子衰变更具限制性。
英文摘要
We revisit precision muon decay in the framework of the LEFT by considering how the LEFT perturbs the total rate as well as the standard and polarization-dependent Michel parameters. We derive the dependence of these observables on the dimension-five and -six LEFT operators, including lepton number violating operators, allowing for arbitrary neutrino flavor assignments. We consider fits of the LEFT to the muon decay data, in particular an approach to neutrino flavor general fits that does not respect the LEFT power counting and assuming new physics couples to all flavors equally and therefore allows for a consistent fit. We then consider how new physics imprints on the SMEFT and subsequently the LEFT in order to constrain specific scenarios of single-field extensions as well as two motivated two-field extensions. While we infer associated mass scales for these scenarios in the hundreds of GeV to multi-TeV range we also find that for the specific cases of lepton number violation, neutrino mass constraints from operator mixing are more restrictive than muon decay.
发表机构
- Universität Wien（维也纳大学）
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