Common origin of reactor and sterile neutrino mixing
Common origin of reactor and sterile neutrino mixing
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DOI：
10.1007/jhep07(2014)039
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发表时间：
2014-02
影响因子：
5.4
通讯作者：
A. Merle;S. Morisi;W. Winter
中科院分区：
文献类型：
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作者：
A. Merle;S. Morisi;W. Winter
如果要认真对待来自短基线异常的轻不育中微子的暗示，全球拟合表明活跃-不育混合的规模与已知的反应堆混合相当。因此，我们研究了活性-无菌混合物和反应器混合物在潜在风味模型中可能具有相同来源的条件。作为起点，我们在活跃的中微子区域使用μ−τ对称性，它(对于三个中微子)产生零的反应堆中微子角和最大的大气中微子角。我们证明，增加一个无菌中微子可以改变这一设置，从而可以同时产生主动-无菌混合和非零θ13。从唯象的角度来看，电子(反)中微子的消失可以很容易地适应，而缪子中微子的消失可以很容易地消失。如果Majorana阶段具有非常具体的值，则即使是LSND结果也可以协调。从理论的角度来看，这种设置需要一些黄酮真空期望值的错位，这可以在使用额外维度的A4或D4风味对称模型中实现。
If the hints for light sterile neutrinos from short-baseline anomalies are to be taken seriously, global fits indicate active-sterile mixings of a magnitude comparable to the known reactor mixing. We therefore study the conditions under which the active-sterile and reactor mixings could have the same origin in an underlying flavour model. As a starting point, we use μ− τ symmetry in the active neutrino sector, which (for three neutrinos) yields a zero reactor neutrino angle and a maximal atmospheric one. We demonstrate that adding one sterile neutrino can change this setting, so that the active-sterile mixing and non-zero θ 13 can be generated simultaneously. From the phenomenological perspective, electron (anti) neutrino disappearance can be easily accommodated, while muon neutrino disappearance can vanish. Even the LSND results can be reconciled if the Majorana phases have very specific values. From the theory perspective, the setting requires the misalignment of some of the flavon vacuum expectation values, which may be achieved in an A 4 or D 4 flavour symmetry model using extra dimensions.