Low-mass doubly charged Higgs bosons at the LHC

Abstract

Search for light (within the mass range 84--200 GeV) doubly charged Higgs bosons decaying into a pair of $W$ bosons has been deemed challenging using the conventional LHC searches with leptons, jets, and missing transverse momentum in the final state. Such Higgses, together with slightly heavier singly-charged and neutral Higgses, when arranged in an $SU(2{)}_{L}$ triplet as in the type-II seesaw model, have been recently shown to accommodate the recent measurement of the $W$-boson mass by the CDF Collaboration. When produced in a highly Lorentz-boosted regime, these tend to manifest as a single fat jet or a pair of adjacent same-sign leptons plus missing transverse momentum. First, we perform a multivariate analysis to discern such exotic jets from the standard model jets. Then, we present a novel search in the final state with an exotic jet and two same-sign leptons plus missing transverse momentum. We find that such low-mass doubly charged Higgses could be directly probed with the already collected Run 2 LHC data.