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arXiv 1012.1618hep-ph
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具有荷电轻子质量矩阵的精确扰动三-双极大中微子混合

Perturbing exactly tri-bimaximal neutrino mixings with charged lepton mass matrices

Davide Meloni, Florian Plentinger, Walter Winter

摘要:

我们研究了三重极大中微子混合的扰动,假设它们只来自带电轻子质量矩阵。在中微子和带电轻子/夸克的质量产生机制有不同起源的情况下,这可能是合理的。作为一个工作假设,我们假设质量纹理可能产生的Froggatt尼尔森机制的带电轻子和夸克部门,这一般会导致强层次结构,而中微子部门是完全三双峰与温和的(正常的)层次结构。我们发现,在这种方法中,偏离最大大气混合可以引入不影响θ_13和θ_12,而θ_13或θ_12从它的三个双极大值的偏差将不可避免地导致一个类似大小的偏差的其他参数。因此,已经非常精确的θ_12指向小sin ^2(2 θ_13)<= 0.01。这种偏离的大小可以由带电轻子结构的特定形式来控制。

英文摘要:

We study perturbations of exactly tri-bimaximal neutrino mixings under the assumption that they are coming solely from the charged lepton mass matrix. This may be plausible in scenarios where the mass generation mechanisms of neutrinos and charged leptons/quarks have a different origin. As a working hypothesis, we assume mass textures which may be generated by the Froggatt-Nielsen mechanism for the charged lepton and quark sectors, which generically leads to strong hierarchies, whereas the neutrino sector is exactly tri-bimaximal with a mild (normal) hierarchy. We find that in this approach, deviations from maximal atmospheric mixing can be introduced without affecting theta_13 and theta_12, whereas a deviation of theta_13 or theta_12 from its tri-bimaximal value will inevitably lead to a similar-sized deviation of the other parameter. Therefore, the already very precise knowledge of theta_12 points towards small sin^2(2 theta_13) <= 0.01. The magnitude of this deviation can be controlled by the specific form of the charged lepton texture.

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