Abstract
We study multi-lepton signatures of the triplet like charged Higgs at the LHC in the context of Y = 0 triplet extended supersymmetric model (TESSM). In TESSM the h ± W ∓ Z coupling appears at tree level when the triplet vacuum expectation value is nonzero, and because of the coupling the charged Higgs decay channels as well as the production channels can dramatically change at the LHC. We show that for the triplet dominated charged Higgs the main production channels are no longer through the top decay or gg and gb fusions since these are very suppressed due to the lack of triplet-SM fermion coupling. In the numerical analysis, we consider also other possible production channels some of which have additional contributions from the diagrams containing h ± W ∓ Z vertex. We investigate the decay channels of a triplet like light charged Higgs ( $$ {m}_{h_1^{\pm }}\le 200 $$ GeV) and show that depending on the triplet component, the charged Higgs can substantially decay to W ± Z. We further examine the 3l, 4l, 5l multi-lepton signatures of the triplet like charged Higgs by considering four different benchmark points for which we perform PYTHIA level simulation using FastJet for jet formation at the LHC with 14 TeV. We found that for favorable parameters the earliest discovery with 5σ signal significance can appear with early data of 72 fb−1 of integrated luminosity. We also present the invariant mass distribution M lljj for (≥ 3ℓ) + ( ≥ 30 GeV) and (≥3ℓ) + (≥2j) + ( ≥ 30 GeV) and show that in addition to the charged Higgs mass peak, an edge that carries information about heavy intermediate neutral Higgs bosons arises at the end of the mass distribution.
Highlights
Besides the models with several Higgs doublets, the charged Higgs can be originated from the models comprising higher representations of Higgs fields such as triplets
In triplet extended supersymmetric model (TESSM) the h±i W ∓Z coupling appears at tree level when the triplet vacuum expectation value is nonzero, and because of the coupling the charged Higgs decay channels as well as the production channels can dramatically change at the LHC
Unlike in the case of MSSM, often the lightest charged Higgs is non-degenerate in mass with CP odd and heavy CP even Higgs bosons
Summary
In TESSM, the field content of the MSSM is enlarged by introducing an SU(2) complex Higgs triplet with zero hypercharge which can be represented as a 2 × 2 matrix. For. simplicity we assume that there is no CP violation in the Higgs sector and all the parameters as well as the vacuum expectation values of the neutral Higgs fields (vevs) are chosen to be real. Such a stringent constraint on the triplet vev prevents the triplet extension from generating μD term effectively as a solution for μ problem of the MSSM. This is why we write the μD term and the triplet-doublet interaction term separately in the superpotential.
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