The four-lepton signal efficiencies in ATLAS's doubly charged Higgs search exceed a strict analytical ceiling, so the corrected expected mass limits are roughly 100 GeV weaker.
Type-II see-saw: searching the LHC elusive low-mass triplet-like Higgses at $e^-e^+$ colliders
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abstract
While the triplet-like Higgses up to a few hundred GeV masses are already excluded for a vast region of the model parameter space from the LHC searches, strikingly, there is a region of this parameter space that is beyond the reach of the existing LHC searches, and doubly/singly-charged and neutral Higgses as light as 200 GeV or even lighter are still allowed by the LHC data. We study several search strategies targeting different parts of this LHC elusive parameter space at two configurations of $e^-e^+$ colliders -- 500 GeV and 1 TeV centre of mass energies. We find that a vast region of this parameter space could be probed with 5$\sigma$ discovery with the early $e^-e^+$ colliders' data.
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Revised exclusion limits on doubly charged Higgs bosons from a reanalysis of the ATLAS multi-lepton search at $\sqrt{s} = 13$,TeV
The four-lepton signal efficiencies in ATLAS's doubly charged Higgs search exceed a strict analytical ceiling, so the corrected expected mass limits are roughly 100 GeV weaker.