Rare muon decays into a positron and two dark matter particles could let MEG-II and Mu3e probe lepton-flavor-violating dark matter interactions at TeV scales, with a radiative decay extending the reach to sub-MeV dark matter.
Flavour in supersymmetry: horizontal symmetries or wave function renormalisation
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abstract
We compare theoretical and experimental predictions of two main classes of models addressing fermion mass hierarchies and flavour changing neutral currents (FCNC) effects in supersymmetry: Froggatt-Nielsen (FN) U(1) gauged flavour models and Nelson-Strassler/extra dimensional models with hierarchical wave functions for the families. We show that whereas the two lead to identical predictions in the fermion mass matrices, the second class generates a stronger suppression of FCNC effects. We prove that, whereas at first sight the FN setup is more constrained due to anomaly cancelation conditions, imposing unification of gauge couplings in the second setup generates conditions which precisely match the mixed anomaly constraints in the FN setup. Finally, we provide an economical extra dimensional realisation of the hierarchical wave functions scenario in which the leptonic FCNC can be efficiently suppressed due to the strong coupling (CFT) origin of the electron mass.
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Flavor-violating dark matter at MEG-II and Mu3e
Rare muon decays into a positron and two dark matter particles could let MEG-II and Mu3e probe lepton-flavor-violating dark matter interactions at TeV scales, with a radiative decay extending the reach to sub-MeV dark matter.