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arXiv 2205.02565hep-ph
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$L_e-L_μ-L_τ$模型中的中微子混合和轻子生成

Neutrino Mixing and Leptogenesis in a $L_e-L_μ-L_τ$ model

Giorgio Arcadi, Simone Marciano, Davide Meloni

摘要:

在超对称性框架下,我们提出了一个简单的推广,在标准模型中加入了三个右手中微子,对于轻子二重态和任意右手荷,我们增加了一个U(1)$)_\text{F}$阿贝尔味对称性和一个非标准轻子荷$L_e-L_μ-L_τ$.我们表明,该模型是能够重现的PMNS矩阵和$r=Δm_\text{sun}^2/Δm_\text{atm}^2$比的混合角的实验值,只有一个温和的微调的拉格朗日自由参数。宇宙的重子不对称性是通过重右手中微子的CP破坏衰变通过热轻子生成产生的。我们提出了一个详细的数值解的相关玻尔兹曼方程占的各种轻子口味的不对称性的分布的影响。

英文摘要:

We present a simple extension of the Standard Model with three right-handed neutrinos in a SUSY framework, with an additional U(1$)_\text{F}$ abelian flavor symmetry with a non standard leptonic charge $L_e-L_μ-L_τ$ for lepton doublets and arbitrary right-handed charges. We show that the model is able to reproduce the experimental values of the mixing angles of the PMNS matrix and of the $r=Δm_\text{sun}^2/Δm_\text{atm}^2$ ratio, with only a moderate fine tuning of the Lagrangian free parameters. The baryon asymmetry of the Universe is generated via thermal leptogenesis through CP-violating decays of the heavy right-handed neutrinos. We present a detailed numerical solution of the relevant Boltzmann equation accounting for the impact of the distribution of the asymmetry in the various lepton flavors.

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