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arXiv 1709.03397hep-ph
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d=7中微子质量模型的轻子数破缺现象

Lepton number violation phenomenology of d=7 neutrino mass models

R. Cepedello, M. Hirsch, J. C. Helo

摘要:

我们研究了d=7的单圈中微子质量模型的唯象。这一特定类别中的所有模型都需要存在几个新的$SU(2)_L$多重态,既有标量的,也有费米子的,因此预测了LHC中丰富的现象学。观察到的中微子质量和混合可以很容易地在这些模型中拟合。有趣的是,尽管观测到的中微子质量很小,但某些特定的轻子数违反(LNV)终态可以通过观测到的分支比产生。这些LNV的最终状态包括轻子和规范玻色子具有高的多重性,如4l+4W,6l+2W等,我们研究这些模型的上限带电轻子味违反衰变,现有的轻子数守恒搜索在LHC和讨论可能的未来LNV搜索当前的约束。

英文摘要:

We study the phenomenology of d=7 1-loop neutrino mass models. All models in this particular class require the existence of several new $SU(2)_L$ multiplets, both scalar and fermionic, and thus predict a rich phenomenology at the LHC. The observed neutrino masses and mixings can easily be fitted in these models. Interestingly, despite the smallness of the observed neutrino masses, some particular lepton number violating (LNV) final states can arise with observable branching ratios. These LNV final states consists of leptons and gauge bosons with high multiplicities, such as 4l+4W, 6l+2W, etc. We study current constraints on these models from upper bounds on charged lepton flavour violating decays, existing lepton number conserving searches at the LHC and discuss possible future LNV searches.

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