Modelling vector-like quarks in partial compositeness framework

Abstract

Composite Higgs models, together with partial compositeness, predict the existence of new scalars and vector-like quarks (partners) at and above the TeV scale. Generically, the presence of these additional scalars opens up new decay topologies for the partners. In this paper we show how to systematically construct the general low energy Lagrangian to capture this feature. We emphasize the specific pattern in the top-partner spectrum arising in this class of models. We then present a concrete realization in the context of the SU(5)/SO(5) coset. We show that the top-partners in this model can have significant branching ratios to the additional scalars and a third generation quark, compared to the usual Standard Model channels. Amongst the most promising signatures at the LHC are final states containing a diphoton resonance along with a top quark.

35 pages, 6 captioned figures. v2: references updated, published in JHEP

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• Pair production of the singlet vector-like B quark at the CLIC
• Vacuum misalignment in presence of four-Fermi operators
• Phase transition and gravitational waves in maximally symmetric composite Higgs model
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Electroweak spin-1 resonances in Composite Higgs models
• Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network