阿基米德跷跷板：小中微子质量与大轻子数破坏
Archimedean Seesaw: Small Neutrino Masses and Large Lepton-number Violation
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中文总结 AI 辅助
该研究提出一类阿基米德跷跷板模型，通过对称性保护的纹理零结构实现大轻子数破坏与小中微子质量共存，预测重中性轻子的活性-惰性混合可在实验中观测到轻子数破坏信号。
中文摘要 AI 辅助
与“可观测轻子数破坏（LNV）必然被微小中微子质量抑制”的普遍认知相反，我们识别出一类跷跷板模型，其中任意大的LNV可与亚eV量级的中微子质量自然共存。我们在中微子汤川耦合和重马约拉纳质量矩阵中构建了一个对称性保护的纹理零结构，该结构产生所需的 accidental 对称性，从而保护轻中微子即便在重 sector 存在任意大LNV时也不会获得质量。小中微子质量源于纹理零结构的抬升，同时保留 underlying 对称性。该框架提供了丰富且实验可及的唯象学，预测在广泛的实验可及质量范围内，重中性轻子具有显著的活性-惰性混合，从而在对撞机和强度前沿实验中产生可观测的LNV信号。
英文摘要
Contrary to the common lore that observable lepton-number violation (LNV) is inevitably suppressed by tiny neutrino masses, we identify a class of seesaw models in which arbitrarily large LNV can naturally coexist with sub-eV neutrino masses. We construct a symmetry-protected texture-zero structure in the neutrino Yukawa couplings and heavy Majorana mass matrix that gives rise to the required accidental symmetry, thereby protecting the light neutrinos from acquiring mass even in the presence of arbitrarily large LNV in the heavy sector. Small neutrino masses arise naturally from lifting the texture-zero structure while preserving the underlying symmetry. The resulting framework offers a rich and experimentally accessible phenomenology, predicting Heavy Neutral Leptons with sizeable active-sterile mixing over a broad range of experimentally accessible masses, giving rise to observable LNV signatures at collider and intensity-frontier experiments.
