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

Abstract

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 ${\mathrm{fb}}^{-1}$ of integrated luminosity recorded in 2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on the decays $H^{\pm \pm }\to e^{\pm }{e}^{\pm }$, $H^{\pm \pm }\to e^{\pm }{\mu }^{\pm }$ and $H^{\pm \pm }\to {\mu }^{\pm }{\mu }^{\pm }$, 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 are derived at 95% confidence level. The observed lower limit on the 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 $B(H^{\pm \pm }\to {\ell }^{\pm }{\ell }^{\pm })$ = 100% and both the expected and observed mass limits are above 450 GeV for $B(H^{\pm \pm }\to {\ell }^{\pm }{\ell }^{\pm })$ = 10% and any combination of partial branching ratios.

52 pages in total, author list starting page 35, 14 figures, 7 tables, published in EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-07/

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