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arXiv 0810.5239hep-phhep-ex
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夸克和轻子混合角的统一参数化

Unified Parametrization for Quark and Lepton Mixing Angles

Werner Rodejohann

摘要:

我们提出了一个新的参数化的夸克和轻子混合矩阵:两个12-混合角(Cabibbo角和角负责太阳中微子振荡)是零阶π/12和π/5,分别。在CKM和PMNS矩阵中得到的12个元素,V_{us}和U_{e2},在这个顺序中是无理数但简单的代数数。我们注意到π/5的余弦是黄金分割比除以2。π/5与太阳中微子混合的观测最佳拟合值之间的差异与三双峰混合的观测值之间的差异具有相同的数量级。为了再现当前拟合的中心值,需要对零阶表达式进行校正。它们很小,并且与夸克和轻子的顺序和符号相同。我们以“triminimal”方式参数化CKM和PMNS矩阵的扰动,即,其中三个小旋转的顺序对应于混合矩阵的PDG描述中的旋转顺序。

英文摘要:

We propose a new parametrization for the quark and lepton mixing matrices: the two 12-mixing angles (the Cabibbo angle and the angle responsible for solar neutrino oscillations) are at zeroth order pi/12 and pi/5, respectively. The resulting 12-elements in the CKM and PMNS matrices, V_{us} and U_{e2}, are in this order irrational but simple algebraic numbers. We note that the cosine of pi/5 is the golden ratio divided by two. The difference between pi/5 and the observed best-fit value of solar neutrino mixing is of the same order as the difference between the observed value and the one for tri-bimaximal mixing. In order to reproduce the central values of current fits, corrections to the zeroth order expressions are necessary. They are small and of the same order and sign for quarks and leptons. We parametrize the perturbations to the CKM and PMNS matrices in a 'triminimal' way, i.e., with three small rotations in an order corresponding to the order of the rotations in the PDG-description of mixing matrices.

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