A 2-3 symmetry in neutrino oscillations
A 2-3 symmetry in neutrino oscillations
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DOI：
10.1016/s0370-2693(01)00465-8
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发表时间：
2001-04
影响因子：
4.4
通讯作者：
C. Lam
中科院分区：
文献类型：
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作者：
C. Lam
大气中微子振荡中的最大混合，以及MNS矩阵元Ue 3的消失，是2-3对称性的结果，在这种对称性下，中微子质量矩阵在第二代和第三代中微子的交换下是不变的。这些2-3对称性的预测与Super-Kamiokande，K2 K和CHOOZ实验的结果一致。如果对称性在右手中微子设定的高能尺度下是精确的，那么在实验能量下，由重整化群修正产生的这些预测将发生偏差。用MSSM动力学，如果中微子质谱上假设正常的层次结构，并且如果电子中微子的质量至少约为0.025 eV，则可以使结果与中微子数据的全局拟合一致。这种质量下限的存在是对称性的一个新颖而有趣的特征，可以通过未来的实验来证伪。在三个可行的太阳中微子解决方案中，只有LMA给出了一个相当大的MNS矩阵元Ue 3，有望在未来的反应堆实验中被检测到。这种对称性不允许中微子的质量等级颠倒。
Maximum mixing in atmospheric neutrino oscillation, as well as vanishing of the MNS matrix element Ue3, are consequences of a 2-3 symmetry, under which the neutrino mass matrix is invariant under the interchange of second and third generation neutrinos. These predictions of the 2-3 symmetry are consistent with the results of Super-Kamiokande, K2K, and CHOOZ experiments. If the symmetry is exact at a high-energy scale set by right-handed neutrinos, a deviation from these predictions generated by renormalization-group corrections will occur at experimental energies. With an MSSM dynamics, the result can be made to agree with a global fit of the neutrino data, if normal hierarchy is assumed on the neutrino mass spectrum and if the mass of the electron-neutrino is at least about 0.025 eV. The presence of this mass lower bound is a novel and interesting feature of the symmetry that can be falsified by future experiments. Of the three viable solar neutrino solutions, only LMA gives a sizable MNS matrix element Ue3that can hopefully be detected in future reactor experiments. Inverted neutrino mass hierarchy is not permitted by this symmetry.