Abstract
We study the non-minimal composite Higgs model with global symmetry SO(7) broken to SO(5) × SO(2). The model results in a composite Two-Higgs doublet model (2HDM) equipped with two extra singlets, the lightest of which can be a viable dark matter candidate. The model is able to reproduce the correct dark matter relic density both via the usual thermal freeze-out and through late time decay of the heavier singlet. In the case of thermal freeze-out, it is possible to evade current experimental constraints even with the minimum fine tuning allowed by electroweak precision tests.
Highlights
The Composite Higgs (CH) paradigm [3,4,5,6] provides a very appealing framework to answer both questions at once, see e.g. the reviews [7,8,9]
We find that a viable DM candidate consistent with all phenomenological constraints can be achieved in this model, without paying the price of an excessive fine tuning on the symmetry breaking scale f with respect to the one dictated by electroweak precision tests (EWPTs)
In this paper we carried out a detailed construction of the CH model based on the symmetry breaking pattern SO(7) → SO(5) × SO(2)
Summary
We construct the low-energy effective theory, valid below the compositeness energy scale Λ, of pNGBs based on the coset SO(7)/SO(5) × SO(2). In the following three subsections, we present the pNGB fields of this theory, the details of the partial compositeness mechanism employed and the radiatively generated pNGB potential
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