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arXiv 2103.01998hep-ph
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短和长基线实验中的非幺正中微子混合

Non-unitary neutrino mixing in short and long-baseline experiments

D. V. Forero, C. Giunti, C. A. Ternes, M. Tortola

摘要:

轻中微子区的非幺正中微子混合是I型跷跷板中微子质量模型的直接结果。在这些模型中,轻中微子混合是用全轻子混合矩阵的一个子矩阵来描述的,因此它一般不是幺正的。因此,中微子振荡的特征在于额外的参数,包括新的CP破坏的来源。在这里,我们执行的短期和长期的基线中微子振荡数据在这个扩展的混合方案的综合分析。我们没有发现一个显着的偏离酉混合,互补的数据集已被用来约束非酉参数。我们还发现,T2K和NOvA紧张的狄拉克CP相的测定中没有减轻的背景下,非幺正中微子混合。

英文摘要:

Non-unitary neutrino mixing in the light neutrino sector is a direct consequence of type-I seesaw neutrino mass models. In these models, light neutrino mixing is described by a sub-matrix of the full lepton mixing matrix and, then, it is not unitary in general. In consequence, neutrino oscillations are characterized by additional parameters, including new sources of CP violation. Here we perform a combined analysis of short and long-baseline neutrino oscillation data in this extended mixing scenario. We did not find a significant deviation from unitary mixing, and the complementary data sets have been used to constrain the non-unitarity parameters. We have also found that the T2K and NOvA tension in the determination of the Dirac CP-phase is not alleviated in the context of non-unitary neutrino mixing.

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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