Abstract
LHC searches with τ leptons in the final state are always inclusive in missing-energy sources. A signal in the flavor-violating Higgs decay search, h → τ μ, could therefore equally well be due to a flavor conserving decay, but with an extended decay topology with additional invisible particles. We demonstrate this with the three-body decay h → τ μφ, where φ is a flavorful mediator decaying to a dark-sector. This scenario can give thermal relic dark matter that carries lepton flavor charges, a realistic structure of the charged lepton masses, and explain the anomalous magnetic moment of the muon, (g − 2)μ, while simultaneously obey all indirect constraints from flavor-changing neutral currents. Another potentially observable consequence is the broadening of the collinear mass distributions in the h → τ μ searches.
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Galon, I., Zupan, J. Dark sectors and enhanced h → τ μ transitions. J. High Energ. Phys. 2017, 83 (2017). https://doi.org/10.1007/JHEP05(2017)083
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DOI: https://doi.org/10.1007/JHEP05(2017)083