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arXiv · 1605.06091

Higgs lepton flavour violation: UV completions and connection to neutrino masses

Juan Herrero-Garcia·Nuria Rius·Arcadi Santamaria
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Abstract

We study lepton violating Higgs (HLFV) decays, first from the effective field theory (EFT) point of view, and then analysing the different high-energy realizations of the operators of the EFT, highlighting the most promising models. We argue why two Higgs doublet models can have a $\mathrm{BR}(h\rightarrow τμ)\sim 0.01$, and why this rate is suppressed in all other realizations including vector-like leptons. We further discuss HLFV in the context of neutrino mass models: in most cases it is generated at one loop giving always $\mathrm{BR}(h\rightarrow τμ) < 10^{-4}$ and typically much less, which is beyond experimental reach. However, both the Zee model and extended left-right symmetric models contain extra ${\rm SU(2)}$ doublets coupled to leptons and could in principle account for the observed excess, with interesting connections between HLFV and neutrino parameters.

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Juan Herrero-Garcia, Nuria Rius, Arcadi Santamaria. 2016-11-11. Higgs lepton flavour violation: UV completions and connection to neutrino masses. https://doi.org/10.1007/jhep11(2016)084

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