Abstract
In the standard model (SM), lepton flavor violating (LFV) Higgs decay is absent at renormalizable level and thus it is a good probe to new physics. In this article we study a type of new physics that could lead to large LFV Higgs decay, i.e., a lepton-flavored dark matter (DM) model which is specified by a Majorana DM and scalar lepton mediators. Different from other similar models with similar setup, we introduce both left-handed and right-handed scalar leptons. They allow large LFV Higgs decay and thus may explain the tentative Br(h → τμ) ∼ 1% experimental results from the LHC. In particular, we find that the stringent bound from τ → μγ can be naturally evaded. One reason, among others, is a large chirality violation in the mediator sector. Aspects of relic density and especially radiative direct detection of the leptonic DM are also investigated, stressing the difference from previous lepton-flavored DM models.
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Baek, S., Kang, Z. Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter. J. High Energ. Phys. 2016, 106 (2016). https://doi.org/10.1007/JHEP03(2016)106
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DOI: https://doi.org/10.1007/JHEP03(2016)106