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arXiv 1106.3587hep-ph
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单圈有限修正对跷跷板中微子质量的重要性

On the importance of the 1-loop finite corrections to seesaw neutrino masses

D. Aristizabal Sierra, Carlos E. Yaguna

摘要:

在标准的跷跷板机制中,对中微子质量矩阵的有限修正来自于重中微子介导的单圈自能图。我们详细研究了这些校正,并证明它们可以是非常重要的,在某些情况下超过了树级结果。我们考虑了轻中微子的正态谱和反态谱,并计算了中微子质量矩阵不同元素的有限修正。特别注意的是,他们的依赖与参数的跷跷板模型。在其中的修正可以是大的情况下,我们确定的微调模型考虑以前在文献中,其中需要实现与实验数据的兼容性的不同参数之间的强抵消。作为一个特定的例子,我们还分析了这些修正如何修改的tribimalmaximum混合模式,并发现偏差可能是相当大的,特别是对于$θ_{13}$。最后,我们强调,由于它们的大尺寸,中微子质量的有限修正必须考虑到,如果一个人想要正确地扫描参数空间的跷跷板模型。

英文摘要:

In the standard seesaw mechanism, finite corrections to the neutrino mass matrix arise from 1-loop self-energy diagrams mediated by a heavy neutrino. We study in detail these corrections and demonstrate that they can be very significant, exceeding in several cases the tree-level result. We consider the normal and inverted hierarchy spectra for light neutrinos and compute the finite corrections to the different elements of the neutrino mass matrix. Special attention is paid to their dependence with the parameters of the seesaw model. Among the cases in which the corrections can be large, we identify the fine-tuned models considered previously in the literature, where a strong cancellation between the different parameters is required to achieve compatibility with the experimental data. As a particular example, we also analyze how these corrections modify the tribimaximal mixing pattern and find that the deviations may be sizable, in particular for $θ_{13}$. Finally, we emphasize that due to their large size, the finite corrections to neutrino masses have to be taken into account if one wants to properly scan the parameter space of seesaw models.

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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