最小修正的Frampton-Glashow-Yanagida Ansatz及其轻子生成后果：基于JUNO的最新结果

中文摘要 AI 辅助

受近期JUNO实验倾向于正中微子质量顺序的指示驱动，我们在含两个右旋中微子的最小I型 seesaw机制中，研究了最小修正的Frampton-Glashow-Yanagida（MMFGY）框架的两种实现方式。两种实现均保留一个精确的Yukawa纹理零，辅以单个物理CP破坏相位或残余CP对称性。显式CP实现产生12种高能Yukawa构型，可归为3种低能类，具有关联的CP相位和无中微子双β衰变预测。两种实现中均可出现强抑制的第二个Yukawa元，尽管在准简并区域中全矩阵层级仍适中。我们针对非简并基准、TeV尺度准简并右旋中微子及更低质量（此时相干产生、振荡和电弱 sphaleron 退耦变得重要）分析轻子生成。在广泛扫描的基准中均获得成功的轻子生成，且在最低质量尺度下对初始右旋中微子丰度的敏感性增加。要求轻子生成成功限制了允许的相位，同时保留近似第二个零的可能性。两种实现呈现不同的近似零模式和轻子生成预测，表明对高能Yukawa结构的不同限制如何影响重子生成。

英文摘要

Motivated by the recent JUNO indication favoring normal neutrino mass ordering, we study two realizations of the minimally modified Frampton--Glashow--Yanagida (MMFGY) framework in the minimal type-I seesaw with two right-handed neutrinos. Both retain one exact Yukawa texture zero, supplemented by either a single physical CP-violating phase or a remnant CP symmetry. The explicit-CP realization yields twelve high-energy Yukawa configurations that reduce to three low-energy classes, with correlated CP phases and predictions for neutrinoless double-beta decay. In both realizations, a strongly suppressed second Yukawa entry can emerge, although the full-matrix hierarchy remains moderate in the quasi-degenerate regime. We analyze leptogenesis for a non-degenerate benchmark, quasi-degenerate TeV-scale right-handed neutrinos, and lower masses where coherent production, oscillations, and electroweak sphaleron freeze-out become important. Successful leptogenesis is obtained across a broad range of the scanned benchmarks, with increased sensitivity to the initial right-handed-neutrino abundance at the lowest mass scale. Requiring successful leptogenesis restricts the allowed phases while preserving the possibility of an approximate second zero. The two realizations exhibit distinct approximate-zero patterns and leptogenesis predictions, demonstrating how different restrictions on the high-energy Yukawa structure affect baryogenesis.

发表机构

• Liaoning Normal University（辽宁师范大学）
• School of Physics and Electronic Technology, Liaoning Normal University（辽宁师范大学物理与电子技术学院）

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