Abstract
Non-minimal Higgs sectors are strongly constrained by the agreement of the measured couplings of the 125 GeV Higgs with Standard Model predictions. This agreement can be explained by an approximate ℤ2 symmetry under which the additional Higgs bosons are odd. This allows the additional Higgs bosons to be approximately inert, meaning that they have suppressed VEVs and suppressed mixing with the Standard Model Higgs. In this case, single production of the new Higgs bosons is suppressed, but electroweak pair production is unsuppressed. We study the phenomenology of a minimal 2 Higgs doublet model that realizes this scenario. In a wide range of parameters, the phenomenology of the model is essentially fixed by the masses of the exotic Higgs bosons, and can therefore be explored systematically. We study a number of different plausible signals in this model, and show that several LHC searches can constrain or discover additional Higgs bosons in this parameter space. We find that the reach is significantly extended at the high luminosity LHC.
Highlights
JHEP09(2019)043 but alignment does not require the new Higgs bosons to be heavy
We study several benchmark models with multi-lepton signals. Simulated events for both signal and Standard Model backgrounds were generated by MadGraph5 [32], with showering and hadronization simulated by Pythia8 [33], and the detector response simulated by Delphes3 [34]
In this paper we considered the phenomenology of a 2-Higgs doublet model where the additional Higgs bosons are almost inert
Summary
We consider a model with 2 Higgs doublets H1, H2 with an approximate Z2 symmetry. H1 → H1, H2 → −H2. We define the fermions to be even under Z2, so in the Z2-symmetric limit, only Yukawa couplings involving H1 are allowed This is a “type I” 2-Higgs doublet model, which naturally avoids non-Standard Model flavor violation. Our focus is on direct searches for new Higgs bosons, so we will avoid flavor problems by making the phenomenological assumption that all flavor breaking is contained in a single set of Yukawa coupling matrices yu, yd and ye. These models satisfy all perturbativity constraints on the potential because the additional Higgs bosons are all light.
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