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Flavoured CP-asymmetry at the effective neutrino mass floor
Nuclear Physics B ( IF 2.8 ) Pub Date : 2020-12-08 , DOI: 10.1016/j.nuclphysb.2020.115268
Nimmala Narendra , Narendra Sahu , S. Uma Sankar

Both neutrinoless double beta decay and leptogenesis require neutrinos to be Majorana fermions. A relation between these two phenomena can be derived once the mechanism of neutrino mass generation is specified. Using the current data from the neutrino oscillations, we constrain the Majorana phases of the neutrino mixing matrix by minimising the effective neutrino mass in neutrinoless double beta decay. Given these Majorana phases at the effective neutrino mass floor, we show that it is possible to obtain a large enough CP asymmetry (108) required for adequate leptogenesis, without additional phases at high scale. Such scenario pushes the lower bound on M1 (the mass of the lightest of the heavy neutrinos in the Type-I see-saw mechanism) to a higher value compared to the usual Davidson-Ibarra bound. In particular, we find that M11010(109) GeV for the case of Normal (Inverted) hierarchy. We extend our analysis to the case when one of the heavy neutrinos decouples (two right handed neutrino models). In this case we find M11010(1011) GeV for the case of Normal (Inverted) hierarchy.



中文翻译:

有效中微子质量底的风味CP不对称

无中微子双β衰变和瘦发生均要求中微子成为马约拉纳费米子。一旦确定了中微子质量产生的机理,就可以推导出这两种现象之间的关系。使用来自中微子振荡的当前数据,我们通过最小化无中微子双β衰变中的有效中微子质量,来约束中微子混合矩阵的Majorana相。考虑到有效中微子质量底的这些Majorana相,我们表明有可能获得足够大的CP不对称性10-8需要足够的瘦素形成,而无需大规模的其他阶段。这种情况将下限推到了中号1个(I型跷跷板机制中最轻的重中微子的质量)达到比通常的Davidson-Ibarra界更高的值。特别是,我们发现中号1个1010109对于正常(反向)层次结构,为GeV。我们将分析扩展到其中一个重中微子解耦的情况(两个右手中微子模型)。在这种情况下,我们发现中号1个10101011 对于正常(反向)层次结构,为GeV。

更新日期:2020-12-08
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