Leptogenesis in unified theories with Type II see-saw
Leptogenesis in unified theories with Type II see-saw
复制标题
带有II型拉锯的统一理论中的轻子发生
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. King
中科院分区：
文献类型：
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作者：
S. Antusch;S. King
在某些基于具有 I 型拉锯机制的统一理论的风味模型中，对最轻右手中微子质量的预测与成功热轻子发生要求的下限相冲突。我们研究了如何通过添加与单位矩阵成比例的 II 型跷跷板贡献来提升绝对中微子质量尺度来解决这个问题。一般来说，提高中微子质量尺度会增加对最轻右手中微子质量的预测，同时增强衰变不对称性并减少冲刷效应，放宽热轻子生成中最轻右手中微子质量的下限。例如，在最轻的右手中微子主导 I 型拉锯贡献的统一理论中，我们发现如果中微子质量尺度大于约 0.15 eV，则热轻子发生成为可能，这使得这种情况可以在不久的将来通过无中微子双贝塔衰变实验进行测试。
In some classes of flavour models based on unified theories with a type I see-saw mechanism, the prediction for the mass of the lightest right-handed neutrino is in conflict with the lower bound from the requirement of successful thermal leptogenesis. We investigate how lifting the absolute neutrino mass scale by adding a type II see-saw contribution proportional to the unit matrix can solve this problem. Generically, lifting the neutrino mass scale increases the prediction for the mass of the lightest right-handed neutrino while the decay asymmetry is enhanced and washout effects are reduced, relaxing the lower bound on the mass of the lightest right-handed neutrino from thermal leptogenesis. For instance in classes of unified theories where the lightest right-handed neutrino dominates the type I see-saw contribution, we find that thermal leptogenesis becomes possible if the neutrino mass scale is larger than about 0.15 eV, making this scenario testable by neutrinoless double beta decay experiments in the near future.