Composite Dark Matter and LHC Interplay

TL;DR

This paper explores composite Higgs models based on the SO(6)/SO(5) coset, analyzing their implications for dark matter and collider physics, and finds current data strongly constrains these models, predicting a dark matter particle near 200 GeV.

Contribution

It provides a detailed phenomenological analysis of SO(6)/SO(5) composite Higgs models linking Higgs, dark matter, and resonances, with predictions testable at LHC and direct detection experiments.

Findings

Models are constrained by current experimental data.

Allowed parameter space emerges for f around 1.1 TeV.

Predicts dark matter mass near 200 GeV, close to experimental sensitivity.

Abstract

The actual realization of the electroweak symmetry breaking in the context of a natural extension of the Standard Model (SM) and the nature of Dark Matter (DM) are two of the most compelling questions in high-energy particle physics. Composite Higgs models may provide a unified picture in which both the Higgs boson and the DM particle arise as pseudo Nambu-Goldstone bosons of a spontaneously broken global symmetry at a scale $f\sim$ TeV. In this paper we analyze a general class of these models based on the coset SO(6)/SO(5). Assuming the existence of light and weakly coupled spin-1 and spin-1/2 resonances which mix linearly with the elementary SM particles, we are able to compute the effective potential of the theory by means of some generalized Weinberg sum rules. The properties of the Higgs boson, DM, top quark and the above resonances are thus calculable and tightly connected. We perform a wide phenomenological analysis, considering both collider physics at the LHC and astrophysical observables. We find that these models are tightly constrained by present experimental data, which are able to completely exclude the most natural setup with $f\simeq 800$ GeV. Upon increasing the value of $f$, an allowed region appears. In particular for $f\simeq 1.1$ TeV we find a concrete realization that predicts $m_{DM}\simeq 200$ GeV for the DM mass. This DM candidate lies close to the present sensitivity of direct detection experiments and will be ruled out - or discovered - in the near future.