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arXiv 1508.04835hep-ph
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左右模型中中微子磁矩与$CP$破坏相的相互作用

Interplay between neutrino magnetic moments and $CP$ violating phases in left-right models

D. Delepine, H. Novales-Sánchez

摘要:

我们在非显性对称的左右模型中重新讨论了中微子的磁矩。在推导出Dirac和Majorana位相的表达式后,我们分析了中微子中微子在两种情况下对这些违反$CP$位相的敏感性:1)最大右混合,即左手中微子和右手中微子被同一个矩阵混合; 2)右手中微子混合,其非对角元素远小于对角元素,但是其中$CP$阶段保持通用。我们的研究结果表明,即使某些值的马约拉纳阶段可以消除中微子振荡,中微子混合矩阵中的最大$CP$违反相的存在,如T2 K结果和反应堆测量之间的差异在中微子振荡支持,要求至少有一个中微子有一个大的非零MM。

英文摘要:

We revisit the neutrino magnetic moments (MMs) in the left-right model with non-manifest symmetry. After deriving an expression in terms of the Dirac and Majorana phases, we analyze the sensitivity of neutrino MMs to these $CP$-violating phases in two scenarios: 1) a maximal right mixing in which left- and right-handed neutrinos are mixed by the same matrix; and 2) a right-handed neutrino mixing whose off-diagonal entries are much smaller than the elements in the diagonal, but where the $CP$ phases remain general. Our results show that, even though certain values of the Majorana phases can eliminate neutrino MMs, the presence of a maximal $CP$-violating phase in neutrino mixing matrix, as favored by the discrepancy between T2K results and reactor measurements in neutrino oscillations, requires that at least one neutrino have a large nonzero MM.

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