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arXiv 2402.18547hep-ph
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具有最小模有限群的最小跷跷板与轻子生成

Minimal seesaw and leptogenesis with the smallest modular finite group

Simone Marciano, Davide Meloni, Matteo Parriciatu

AI总结:

提出基于$Γ_2\cong S_3$的最小模对称轻子模型,用两个重右手中微子同时实现低能大CP破坏、轻子生成和最小跷跷板,并拟合中微子观测量与重子不对称性。

摘要:

我们提出了一个基于最小模有限群$Γ_2\cong S_3$的轻子模型,该模型首次同时解释了轻子能区存在大的低能CP破坏的迹象,以及仅由两个重右手中微子产生的宇宙物质—反物质不对称性。这些相同的态也被用于最小跷跷板机制,以产生轻中微子质量。除重中微子外,我们的粒子内容与标准模型(SM)相同,只增加了一个单一的模参数$τ$,其真空期望值同时负责模对称性和CP对称性的破缺。我们表明,这种极简的标准模型扩展足以极好地拟合低能中微子观测量以及所需的重子不对称性$η_B$。文中还给出了对中微子质量顺序、无中微子双β衰变和氚衰变中的有效质量,以及Majorana相位的预测。

英文摘要:

We propose a model for leptons based on the smallest modular finite group $Γ_2\cong S_3$ that, for the first time, accounts for both the hints of large low-energy CP-violation in the lepton sector and the matter-antimatter asymmetry of the Universe, generated by only two heavy right-handed neutrinos. These same states are also employed in a Minimal seesaw mechanism to generate light neutrino masses. Besides the heavy neutrinos, our particle content is the same as the Standard Model (SM), with the addition of one single modulus $τ$, whose vacuum expectation value is responsible for both the modular and CP-symmetry breakings. We show that this minimalistic SM extension is enough to get an excellent fit to low energy neutrino observables and to the required baryon asymmetry $η_B$. Predictions for the neutrino mass ordering, effective masses in neutrinoless double beta decay and tritium decay as well as for the Majorana phases are also provided.

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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