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.
Exploring the Doubly Charged Higgs of the Left-Right Symmetric Model using Vector Boson Fusion-like Events at the LHC
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This paper studies the pair production of the doubly charged Higgs boson of the left-right symmetric models using multilepton final state in the vector boson fusion (VBF)-like processes. The study is performed in the framework consistent with the model's correction to the standard model $\rho_{EW}$ parameter. VBF topological cuts, number of leptons in the final state and $p_T$ cuts on the leptons are found to be effective in suppressing the background. Significant mass reach can be achieved for exclusion/discovery of the doubly charge Higgs boson for the upcoming LHC run with a luminosity of $\mathcal{O}(10^3)$ fb$^{-1}$.
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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.