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arXiv 1201.3155hep-ph
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镜像费米子左右模型中的中微子混合和质量

Neutrino mixing and masses in a left-right model with mirror fermions

R. Gaitan, A. Hernández-Galeana, J. M. Rivera-Rebolledo, P. Fernández de Córdoba

备注：
Accepted by European Physical Journal C
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摘要：

在规范群为SU（3）$_{C} \otimes SU(2)_{L} \otimes SU(2)_{R} \otimes U(1)_{Y^\prime}$的镜像费米子的左右模型框架下，我们估计了中微子的质量，发现与实验上的边界和层次是一致的.本文计算了轻子味破坏过程$μ\rightarrow e γ$、$τ\rightarrow μγ$和$τ\rightarrow eγ$的衰变率。我们得到的风味变化的分支比的上限与他们目前的实验界限。我们还估计了重Majorana中微子在通道$N \rightarrow W^{\pm} l^{\mp}$，$N \rightarrow Z ν_{l}$和$N \rightarrow H ν_{l}$中的衰变率，对于大的重中微子质量值，它们大致相等。从最一般的Majorana中微子质量矩阵出发，活动中微子质量的微小性是由所涉及尺度的层次结构和跷跷板机制的双重应用共同作用的结果。对中微子质量矩阵的结构进行适当的参数化，使电子中微子与μ子和τ中微子对称混合，从而得到轻中微子的三双峰混合矩阵。

英文摘要：

In the framework of a left-right model containing mirror fermions with gauge group SU(3)$_{C} \otimes SU(2)_{L} \otimes SU(2)_{R} \otimes U(1)_{Y^\prime}$, we estimate the neutrino masses, which are found to be consistent with their experimental bounds and hierarchy. We evaluate the decay rates of the Lepton Flavor Violation (LFV) processes $μ\rightarrow e γ$, $τ\rightarrow μγ$ and $τ\rightarrow eγ$. We obtain upper limits for the flavor-changing branching ratios in agreement with their present experimental bounds. We also estimate the decay rates of heavy Majorana neutrinos in the channels $N \rightarrow W^{\pm} l^{\mp}$, $N \rightarrow Z ν_{l}$ and $N \rightarrow H ν_{l}$, which are roughly equal for large values of the heavy neutrino mass. Starting from the most general Majorana neutrino mass matrix, the smallness of active neutrino masses turns out from the interplay of the hierarchy of the involved scales and the double application of seesaw mechanism. An appropriate parameterization on the structure of the neutrino mass matrix imposing a symmetric mixing of electron neutrino with muon and tau neutrinos leads to Tri-bimaximal mixing matrix for light neutrinos.

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