论文标题
探索带电的Lepton风味违反衰减的可行性$ \ rightarrow e +γ$ inverse和Lineal Seesaw机制，带有$ A_4 $ a _4 $ a themorty symertry
Exploring the feasibility of the charged lepton flavor violating decay $ μ\rightarrow e + γ$ in inverse and linear seesaw mechanisms with $A_4$ flavour symmetry
论文作者
论文摘要
解释观察到的基本颗粒风味结构的可能方法之一是在理论中包括风味对称性。在这项工作中，我们调查了稀有充电的Lepton风味（CLFV）衰减过程（$μ\ rightarroweγ$），其中两个低尺度（$ \ sim $ tev）Seesaw模型：（i）在$ a_ promport $ a _ _ {4} $ a promistry的框架内，反瑟索（IS）和（ies）和（ii）线性Seesaw（II）线性Seesaw（ii）线性seesaw（ii）。除了$ a_ {4} $风味对称性外，还包括$ u（1）_ {x} $，$ z_4 $和$ z_5 $的其他一些对称性来构建Lagrangian。我们使用先前工作的结果\ cite {devi：2021ujp，devi：2021aaz}，在其中我们计算了未知的中微子振荡参数，其全球最佳拟合值的$3σ$限制在$3σ$限制之内，并应用这些结果来计算两个模型的Muon衰减的分支比率（BR）。接下来，我们将结果与当前的实验界限和BR的灵敏度限制（$ \ rightArroweγ$）进行了比较，并通过各种实验预测，并提供了比较分析，即两个模型中的哪个更有可能通过当前/未来实验进行测试。这是针对当前允许的非非军事参数的各种值完成的。这项比较研究将有助于我们确定哪种低尺度SEESAW模型和三重flavon VEV对准将更加可行和有利，可在共同的风味对称性下进行测试（此处$ a_ {4} $），因此可以帮助歧视这两个模型。
One of the possible ways to explain the observed flavour structure of fundamental particles is to include flavor symmetries in the theories. In this work, we investigate the rare charged lepton flavour violating (cLFV) decay process ($μ\rightarrow eγ$) in two of the low scale ($\sim$TeV) seesaw models: (i) the Inverse seesaw (ISS) and (ii) Linear seesaw (LSS) models within the framework of $A_{4}$ flavour symmetry. Apart from the $ A_{4} $ flavour symmetry, some other symmetries like $U(1)_{X}$, $Z_4$ and $Z_5$ are included to construct the Lagrangian. We use results from our previous work \cite{Devi:2021ujp,Devi:2021aaz} where we computed unknown neutrino oscillation parameters within $3 σ$ limits of their global best fit values, and apply those results to compute the branching ratio (BR) of the muon decay for both the seesaw models. Next we compare our results with the current experimental bounds and sensitivity limits of BR($μ\rightarrow eγ$) as projected by various experiments, and present a comparative analysis that which of the two models is more likely to be tested by which current/future experiment. This is done for various values of currently allowed non-unitarity parameter. This comparative study will help us to pinpoint that which of the low scale seesaw models and triplet flavon VEV alignments will be more viable and favourable for testing under a common flavour symmetry ($A_{4}$ here), and hence can help discriminate between the two models.
