Abstract
Colored fermionic partners of the top quark are well-known signatures of the Composite Higgs scenario and for this reason they have been and will be subject of an intensive experimental study at the LHC. Performing an assessment of the theoretical implications of this experimental effort is the goal of the present paper. We proceed by analyzing a set of simple benchmark models, characterized by simple two-dimensional parameter spaces where the results of the searches are conveniently visualized and their impact quantified. We only draw exclusion contours, in the hypothesis of no signal, but of course our formalism could equally well be used to report discoveries in a theoretically useful format.
Highlights
The existence of the top partners, i.e. colored fermionic resonances with TeV-sized mass coupled to top and bottom quarks, is an unavoidable universal prediction of partial compositeness in the top sector
The strategy we proposed in ref. [46], which we will employ in the present paper, consists in reporting the result of each search in the appropriate mass-coupling plane of a phenomenological Lagrangian, suited for being interpreted in more complete explicit models
Top partners are important in CH because they are connected with the generation of the Higgs potential and in turn with the physical Higgs boson mass and with the EW Symmetry Breaking (EWSB) scale v 246 GeV
Summary
As a first class of models we consider the ones that represent the “minimal tuning” case. The right-handed tR component, on the other hand, can be either mixed with composite operators that are singlets under SO(5), or realized as a composite chiral singlet originating directly from the stronglycoupled dynamics. This set-up is usually denoted as the 14 + 1 scenario [28, 48]. The amount of tuning is minimized if the tR field is a fully composite state or an elementary state with a large, nearly maximal coupling with the composite dynamics In both cases the phenomenology of the model is quite similar, the only difference being a minor modification in the estimates for the coefficients in the effective Lagrangian. In the following we will focus only on the scenarios characterized by a light 4-plet or a light singlet
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