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arXiv 1302.1872hep-ph
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用TeV-scale无菌中微子改进电弱配合

Improving Electro-Weak Fits with TeV-scale Sterile Neutrinos

Evgeny Akhmedov, Alexander Kartavtsev, Manfred Lindner, Lisa Michaels, Juri Smirnov

摘要:

我们在标准模型的I型跷跷板扩展框架下研究了TeV尺度的不育中微子对电弱精密观测量和轻子数与味违反衰变的影响。在树水平上,不育中微子通过PMNS矩阵的非么正性表现出来,在单圈水平上,它们修改了倾斜辐射修正。我们推导出明确的公式的S,T,U参数的中微子质量和混合,并进行数值拟合的电弱观测。我们发现一个相当大的活性无菌混合的参数空间的区域,提供了一个更好的全面配合的情况下,混合可以忽略不计。具体来说,我们发现不可见的Z-衰变宽度,中微子散射实验的电荷与中性电流比和W玻色子质量的偏差从理论预期的改进。

英文摘要:

We study the impact of TeV-scale sterile neutrinos on electro-weak precision observables and lepton number and flavour violating decays in the framework of a type-I see-saw extension of the Standard Model. At tree level sterile neutrinos manifest themselves via non-unitarity of the PMNS matrix and at one-loop level they modify the oblique radiative corrections. We derive explicit formulae for the S,T,U parameters in terms of the neutrino masses and mixings and perform a numerical fit to the electro-weak observables. We find regions of parameter space with a sizable active-sterile mixing which provide a better over-all fit compared to the case where the mixing is negligible. Specifically we find improvements of the invisible Z-decay width, the charged-to-neutral-current ratio for neutrino scattering experiments and of the deviation of the W boson mass from the theoretical expectation.

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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