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arXiv 1407.6607hep-ph
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轻子混合矩阵的非么正性:现在的界限和未来的敏感性

Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities

Stefan Antusch, Oliver Fischer

摘要:

有效轻子混合矩阵在低能量下的非么正性是标准模型(SM)扩展的通用信号,该扩展具有额外的费米子单线态粒子,即无菌或右手中微子,以解释观测到的中微子质量。这种扩展的低能量效应可以通过最小么正破坏(MUV)方案(SM的有效场论扩展)以与模型无关的方式来描述。我们执行的MUV方案参数的全局拟合到目前的实验数据,这产生了最新的轻子非么正性的约束。此外,我们调查的敏感性和未来实验的发现前景。特别是,FCC-ee/TLEP将是一个强大的探针的味道保存非幺正性的单重质量高达~ 60 TeV。关于味道违反非么正性,未来的实验在原子核中的μ子到电子转换甚至可以探测单重质量高达~ 0.3 PeV的扩展。

英文摘要:

The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. sterile or right-handed neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ~ 60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ~ 0.3 PeV.

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