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arXiv 1206.4754hep-ph
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中微子质量矩阵的非三双峰模式的(Z_2)^3对称性

The (Z_2)^3 symmetry of the non-tri-bimaximal pattern for the neutrino mass matrix

E. I. Lashin, M. Abbas, N. Chamoun, S. Nasri

摘要:

鉴于最近的中微子振荡数据指向一个非零值的最小混合角($θ_z$),我们得到并找到明确的实现的$(Z_2)^3$味对称性的特点,为中微子质量矩阵,唯一的一个变体的三分形式,最初设想导致三双峰混合与$θ_z=0$,从而现在允许具有非零$θ_z$非三双峰模式。我们施加这种味道对称性的设置,包括带电轻子,我们看到,它可以腾出空间,通过高阶项涉及新的SM-单重标量,带电轻子的质量等级。此外,在I型跷跷板机制中,狄拉克和马约拉纳中微子质量矩阵中出现的某些模式可以容纳有效中微子质量矩阵中所有类型的质量等级,但不能产生轻子/重子不对称。最后,我们讨论了如何II型跷跷板机制时,补充味对称性,可以用来解释所观察到的重子不对称通过leptogenesis。

英文摘要:

In view of the recent neutrino oscillation data pointing to a non-vanishing value for the smallest mixing angle ($θ_z$), we derive and find explicit realizations of the $(Z_2)^3$ flavor symmetry which characterizes, for the neutrino mass matrix, uniquely a variant of the tripartite form, originally conceived to lead to the tri-bimaximal mixing with $θ_z=0$, so that to allow now for a non-tri-bimaximal pattern with non-zero $θ_z$. We impose this flavor symmetry in a setting including the charged leptons and we see that it can make room, through higher order terms involving new SM-singlet scalars, for the mass hierarchy of charged leptons. Moreover, within type-I seesaw mechanism augmented with the flavor symmetry, certain patterns occurring in both the Dirac and the Majorana neutrino mass matrices can accommodate all types of mass hierarchies in the effective neutrino mass matrix, but no lepton/baryon asymmetry can be generated. Finally, we discuss how type-II seesaw mechanism, when supplemented with the flavor symmetry, could be used to interpret the observed baryon asymmetry through leptogenesis.

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