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arXiv 2201.10759hep-phhep-ex
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Stueckelberg $U(1)_X$模型中的轻子味破坏和暗生Majorana中微子质量

Lepton flavor violation and scotogenic Majorana neutrino mass in a Stueckelberg $U(1)_X$ model

Chuan-Hung Chen, Cheng-Wei Chiang, Takaaki Nomura, Chun-Wei Su

摘要:

我们在标准模型的规范$U(1)_X$扩展中构造了一个暗生Majorana中微子质量模型,其中规范玻色子的质量和完整的规范对称性可以通过Stueckelberg机制实现,从而得到稳定的暗物质(DM).结果表明,最简单的扩展模型由两个惰性希格斯偶态和一个矢量单态费米子组成。除了研究Majorana中微子质量外,我们还研究了轻子味破坏过程,如$\ell_i \to \ell_j γ$、$\ell_i \to 3 \ell_j$、核内的$μ-e$转换率以及μ介子-反μ介子振荡.我们发现,灵敏度的$μ\to 3e$和$μ-e$转换率设计的Mu 3e和彗星/Mu 2 e实验中,这两个衰变的最严重的限制$μ\to e$ LFV过程。发现$τ\to μγ$和$τ\to 3μ$均能达到Belle II设计的显著性水平。除了解释DM残余密度外,我们还证明了DM-核子散射截面能够满足目前DM直接探测的实验极限。

英文摘要:

We construct a scotogenic Majorana neutrino mass model in a gauged $U(1)_X$ extension of the standard model, where the mass of the gauge boson and the unbroken gauge symmetry, which leads to a stable dark matter (DM), can be achieved through the Stueckelberg mechanism. It is found that the simplest version of the extended model consists of the two inert-Higgs doublets and one vector-like singlet fermion. In addition to the Majorana neutrino mass, we study the lepton flavor violation (LFV) processes, such as $\ell_i \to \ell_j γ$, $\ell_i \to 3 \ell_j$, $μ-e$ conversion rate in nucleus, and muonium-antimuonium oscillation. We show that the sensitivities of $μ\to 3e$ and $μ-e$ conversion rate designed in Mu3e and COMET/Mu2e experiments make both decays the most severe constraints on the $μ\to e$ LFV processes. It is found that $τ\to μγ$ and $τ\to 3μ$ can reach the designed significance level of Belle II. In addition to explaining the DM relic density, we also show that the DM-nucleon scattering cross section can satisfy the currently experimental limit of DM direct detection.

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