Modelling vector-like quarks in partial compositeness framework

TL;DR

This paper develops a systematic framework for modeling vector-like quarks within partial compositeness models, highlighting new decay channels involving scalars and proposing distinctive LHC signatures such as diphoton resonances with top quarks.

Contribution

It introduces a comprehensive method to construct the low energy Lagrangian for vector-like quarks in partial compositeness models, including new decay topologies involving scalars.

Findings

Top-partners can have significant branching ratios to scalars and third-generation quarks.

Distinctive LHC signatures include diphoton resonances with top quarks.

The model demonstrates specific patterns in the top-partner spectrum.

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.