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在 $L^{}_e-L^{}_α$ 规范扩展模型的 I+II 型跷跷板机制中探索中微子质量与 $(g-2)_{μ, e}$

Exploring neutrino masses, $(g-2)_{μ, e}$ in type I+II seesaw in ${L^{}_e-L^{}_α}$ gauge extended model

Papia Panda, Priya Mishra, Mitesh Kumar Behera, Shivaramakrishna Singirala, Rukmani Mohanta

AI总结:

提出含标量三重态与右手中微子的 I+II 型跷跷板 $U(1)_{L_e-L_α}$ 模型,解释中微子振荡数据及轻子反常磁矩,并评估未来长基线实验的检验能力。

摘要:

本文旨在通过 I+II 型跷跷板机制,探索中微子部分中 $U(1)_{L_e-L_α}$(其中 $α=τ, μ$)规范对称性的含义。为构建这一混合框架,我们引入一个标量三重态和三个右手中微子。该模型能够在 NuFit v5.2 中微子振荡数据的 $3σ$ 范围内,成功解释活性中微子质量、混合角、质量平方差以及 CP 破坏相位。MeV 能标下新规范玻色子的存在,可在其实验限制范围内解释 μ 子和电子的 $(g-2)$。此外,我们在 DUNE、P2SO、T2HK 和 T2HKK 等即将开展的长基线中微子实验背景下,仔细审查了所提出的模型。结果表明,P2SO 和 T2HK 能够在其 $5σ$ 允许的振荡参数区域内探测这两个模型;而如果振荡参数的真实值与 NuFit v5.2 保持一致,DUNE 和 T2HKK 在其 $5σ$ 参数空间内只能决定性地检验具有 $U(1)_{L_e-L_μ}$ 对称性的模型。

英文摘要:

This paper aims to explore the implications of $U(1)_{L_e-L_α}$ gauge symmetries, where $α=τ, μ$, in the neutrino sector through the type-(I+II) seesaw mechanisms. To achieve such a hybrid framework, we include a scalar triplet and three right-handed neutrinos. The model can successfully account for the active neutrino masses, mixing angles, mass squared differences, and the CP-violating phase within the $3 σ$ bounds of NuFit v5.2 neutrino oscillation data. The presence of new gauge boson at the MeV scale provides an explanation for the muon and electron $(g-2)$ within the confines of their experimental limits. Furthermore, we scrutinize the proposed models in the context of upcoming long-baseline neutrino experiments such as DUNE, P2SO, T2HK, and T2HKK. The findings reveal that P2SO and T2HK have the ability to probe both the models in their $5 σ$ allowed oscillation parameter region, whereas DUNE and T2HKK can conclusively test only model with $U(1)_{L_e-L_μ}$- symmetry within their $5 σ$ parameter space if the true values of the oscillation parameters remain consistent with NuFit v5.2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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