Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton–proton collisions at s√=13TeV

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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 search uses a proton–proton collision data sample at a centre-of-mass energy of 13 TeV corresponding to 36.1 fb−1 of integrated luminosity recorded in 2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on the decays H±±→e±e± , H±±→e±μ± and H±±→μ±μ± , fitting the dilepton mass spectra in several exclusive signal regions. No significant evidence of a signal is observed and corresponding limits on the production cross-section and consequently a lower limit on m(H±±) are derived at 95% confidence level. With ℓ±±=e±e±±μ±/e±μ± , the observed lower limit on the mass of a doubly charged Higgs boson only coupling to left-handed leptons varies from 770 to 870 GeV (850 GeV expected) for B(H±±→ℓ±±)=100% and both the expected and observed mass limits are above 450 GeV for B(H±±→ℓ±±)=10% and any combination of partial branching ratios.

Bibliographic note

52 pages in total, author list starting page 35, 14 figures, 7 tables, published in EPJC, All figures including auxiliary figures are available at


Original languageEnglish
Article number199
Number of pages34
JournalEuropean Physical Journal C
Issue number3
Publication statusPublished - 10 Mar 2018


  • hep-ex