Abstract
Composite Higgs models, where the Higgs boson is identified with the pseudo-Nambu-Goldstone-Boson (pNGB) of a strong sector, typically have light composite fermions (top partners) to account for a light Higgs. This type of models, generically also predicts the existence of heavy vector fields (composite gluons) which appear as an octet of QCD. These composite gluons become very broad resonances once phase-space allows them to decay into two composite fermions. This makes their traditional experimental searches, which are designed to look for narrow resonances, quite ineffective. In this paper, we as an alternative, propose to utilize the impact of composite gluons on the production of top partners to constrain their parameter space. We place constraints on the parameters of the composite resonances using the 8 TeV LHC data and also assess the reach of the 14 TeV LHC. We find that the high luminosity LHC will be able to probe composite gluon masses up to ∼ 6 TeV, even in the broad resonance regime.
Highlights
They can be identified with the Kaluza-Klein (KK) excitation of the SM gluons in the five-dimensional realizations of the composite scenarios [5]
In order to constrain the heavy composite gluons, we recast their results in the following way: we consider that a point in the parameter space of the model is excluded if the number of events predicted by the model Nmodel is larger than the 95% C.L. exclusion limit reported by the experimental collaborations
In this paper we have studied the collider phenomenology of the composite gluon within a composite Higgs model framework
Summary
They can be identified with the Kaluza-Klein (KK) excitation of the SM gluons in the five-dimensional realizations of the composite scenarios [5]. One of the interesting features of this particle is that it decays with 100% branching ratio into the tW final state which, after the further decay of the top quark, leads to the same sign di-lepton final state This interesting feature was used recently in the experimental studies to put bound on the mass of the fermionic top partners, M5/3 800 GeV [29]. Note that this bound was obtained assuming only the QCD pair production of the charge 5/3 field. Later it was realized that the electroweak single production of the charge 5/3 field can lead to the same final state, making the overall bound even stronger [41, 43]
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