Abstract
A composite Higgs boson is likely to be accompanied by additional light states generated by the same dynamics. This expectation is substantiated when realising the composite Higgs mechanism by an underlying gauge theory. We review the dynamics of such objects, which may well be the first sign of compositeness at colliders. We also update our previous analysis of the bounds from LHC searches to the latest results, and discuss the projected reach of the High-Luminosity run.
Highlights
Models of composite Higgs are a valid option for describing new physics beyond the Standard Model (SM)
The idea of dynamical EW symmetry breaking is as old as the SM itself [1], in its first form lacked the presence of a light scalar degree of freedom, the Higgs boson
The Higgs arises as a pseudo-Nambu Goldstone boson (pNGB) from the symmetry breaking pattern SO(5)/SO(4), together with the three Goldstones eaten by the W and Z bosons
Summary
Models of composite Higgs are a valid option for describing new physics beyond the Standard Model (SM). Light Composite Scalars the potential generated by such loops can be stabilized by, for instance, the introduction of masses for the underlying fermions [14, 15] Another approach to composite dynamics, closer in spirit to the origin of the dynamical EW symmetry breaking of Technicolor, consists in defining an underlying theory in terms of gauge and fermion degrees of freedom, that confine at low energies [15]. There is always a non-anomalous U(1) charge, acting on both species of fermions, which is broken by (at least) the chiral condensate in the EW (Higgs) sector of the theory This results in one light pNGB singlet under all the SM gauge symmetries.
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