For a benchmark singly charged scalar that decays to leptons plus invisible particles, LHC data still allow masses above about 185 GeV and in a window near 80-125 GeV, and a boosted-decision-tree search could probe these regions more efficiently than standard cut-based analyses.
Freeze-in Leptogenesis via Dark-Matter Oscillations
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abstract
We study the cosmology and phenomenology of freeze-in baryogenesis via dark-matter oscillations, taking the dark matter to couple to Standard Model leptons. We investigate viable models both with and without a $Z_2$ symmetry under which all new fields are charged. Lepton flavor effects are important for leptogenesis in these models, and we identify scenarios in which the baryon asymmetry is parametrically distinct from and enhanced relative to leptogenesis from sterile neutrino oscillations. The models we study predict the existence of new, electroweak-charged fields, and can be tested by a combination of collider searches, structure-formation studies, X-ray observations, and terrestrial low-energy tests.
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Closing in on singly charged scalars
For a benchmark singly charged scalar that decays to leptons plus invisible particles, LHC data still allow masses above about 185 GeV and in a window near 80-125 GeV, and a boosted-decision-tree search could probe these regions more efficiently than standard cut-based analyses.