Search for doubly charged Higgs boson production in multi-lepton final states using 139 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A search for pair production of doubly charged Higgs bosons ($H^{\pm \pm }$), each decaying into a pair 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 an integrated luminosity of 139 fb${}^{-1}$ recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. This analysis focuses on same-charge leptonic decays, $H^{\pm \pm }\to {\ell }^{\pm }{\ell }^{\prime \pm }$ where $\ell ,{\ell }^{\prime }=e,\mu ,\tau$, in two-, three-, and four-lepton channels, but only considers final states which include electrons or muons. No evidence of a signal is observed. Corresponding limits on the production cross-section and consequently a lower limit on $m(H^{\pm \pm })$ are derived at 95% confidence level. Assuming that the branching ratios to each of the possible leptonic final states are equal, $\mathcal{B}(H^{\pm \pm }\to e^{\pm }{e}^{\pm })=\mathcal{B}(H^{\pm \pm }\to e^{\pm }{\mu }^{\pm })=\mathcal{B}(H^{\pm \pm }\to {\mu }^{\pm }{\mu }^{\pm })=\mathcal{B}(H^{\pm \pm }\to e^{\pm }{\tau }^{\pm })=\mathcal{B}(H^{\pm \pm }\to {\mu }^{\pm }{\tau }^{\pm })=\mathcal{B}(H^{\pm \pm }\to {\tau }^{\pm }{\tau }^{\pm })=1/6$, the observed lower limit on the mass of a doubly charged Higgs boson is 1080 GeV within the left-right symmetric type-II seesaw model, which is an improvement over previous limits. Additionally, a lower limit of $m(H^{\pm \pm })$ = 900 GeV is obtained in the context of the Zee-Babu neutrino mass model.

31 pages in total, no author list, 9 figures, 6 tables, submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-34/

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