A search for a doubly-charged Higgs boson, $\Phi^{\pm\pm}$, in proton-proton collisions at \sqrt{s} = 13~\mathrm{TeV} with the CMS experiment at the LHC using a data sample corresponding to an integrated luminosity of 12.9~\mathrm{fb}^{-1} is presented. The search considers final states with three lepton final states coming from the associated production of $\Phi^{\pm\pm}\Phi^{\mp}$ and the four lepton final states coming from the pair production of $\Phi^{++}\Phi^{--}$. Lower bounds on the doubly-charged Higgs boson mass are reported for a variety of assumptions on its branching ratio to charged lepton pairs.

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