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arXiv 1401.6397hep-ph
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U(3)有限离散子群的无质量中微子和轻子混合斑图

A massless neutrino and lepton mixing patterns from finite discrete subgroups of U(3)

Anjan S. Joshipura, Ketan M. Patel

摘要:

研究了具有预测混合角的无质量中微子的味对称$G_f$的有限离散子群$U(3)$.这是通过假设适合于描述无质量中微子的剩余对称性$S_ν$包含在$G_f$中来实现的。证明了所有由一组特定的$3\times 3$矩阵生成的具有三维忠实不可约表示的群$G_f$只包含无质量态的三种味成分之一,即未混合的、等概率最大混合的和概率(0,1/2,1/2)最大混合的以及它们的排列.无论$G_f$的阶数和其中的$S_ν$的选择如何,这一结果都是成立的,所有这些都导致了对太阳混合角的不利的首阶预报。数值研究了阶数小于512的$U(3)$子群的中微子混合模式,发现其中只有一个子群可以得到无质量的中微子,并且所有混合角的前阶预测都接近实验值.提出了太阳角预报的修正方法,并讨论了两个给出观测到的混合型的具体例子。

英文摘要:

Finite discrete subgroups of $U(3)$ as possible flavour symmetries $G_f$ for a massless neutrinos with predictive mixing angles are studied. This is done by assuming that a residual symmetry $S_ν$ appropriate for describing a massless neutrino is contained in $G_f$. It is shown that all the groups $G_f$ admitting three dimensional faithful irreducible representation and generated from a specific set of $3\times 3$ matrices imply only one of the three flavour compositions for the massless state namely, unmixed, maximally mixed with equal probabilities and bimaximally mixed with probabilities (0,1/2,1/2) and their permutations. This result holds irrespective of the order of $G_f$ and the choice of $S_ν$ within it. All of these lead to unfavourable leading order prediction for the solar mixing angle. Neutrino mixing pattern is then numerically investigated in case of subgroups of $U(3)$ with order less than 512 and it is found that only one of these can lead to a massless neutrino and leading order predictions for all the mixing angles close to their experimental values. Ways to correct for the solar angle prediction are proposed and two concrete examples giving the observed mixing pattern are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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