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

Agni Bethani, Yang Qin, James Howarth, Rafal Bielski, Ian Connelly, Brian Cox, Cinzia Da Via, Nicholas Dann, Frederick Loebinger, Jiri Masik, Stephen Menary, Francisca Munoz Sanchez, Alexander Oh, Yvonne Peters, Andrew Pilkington, Rhys Roberts, Savanna Shaw, Stephen Watts, Fabian Wilk, Terence Wyatt

    Research output: Contribution to journalArticlepeer-review

    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 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±ℓ±=e±e±/μ±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±ℓ±)=100% and both the expected and observed mass limits are above 450 GeV for B(H±±→ℓ±ℓ±)=10% and any combination of partial branching ratios.
    Original languageEnglish
    JournalEuropean Physical Journal C. Particles and Fields
    Volume78
    Issue number199
    Early online date10 Mar 2018
    DOIs
    Publication statusPublished - 2018

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