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A search for doubly charged Higgs bosons with pairs of prompt, isolated,highly energetic leptons with the same electric charge is presented. The searchuses a proton-proton collision data sample at a centre-of-mass energy of 13 TeVcorresponding to 36.1 $\mathrm{fb}^{-1}$ of integrated luminosity recorded in2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on thedecays $H^{\pm\pm}\rightarrow e^{\pm}e^{\pm}$, $H^{\pm\pm}\rightarrowe^{\pm}\mu^{\pm}$ and $H^{\pm\pm}\rightarrow \mu^{\pm}\mu^{\pm}$, fitting thedilepton mass spectra in several exclusive signal regions. No significantevidence of a signal is observed and corresponding limits on the productioncross-section are derived at 95% confidence level. The observed lower limit onthe mass of a doubly charged Higgs boson only coupling to left-handed leptons($e$,$\mu$) varies from 770 GeV to 870 GeV (850 GeV expected) for$B(H^{\pm\pm}\rightarrow \ell^{\pm}\ell^{\pm})$ = 100% and both the expectedand observed mass limits are above 450 GeV for $B(H^{\pm\pm}\rightarrow\ell^{\pm}\ell^{\pm})$ = 10% and any combination of partial branching ratios.

european physical journal. c, particles and fields

Search for doubly charged Higgs boson production in multi-lepton final  states with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ =  13 TeV