Abstract
We propose novel bosonic Technicolor models augmented by an SU(2)R gauge group and scalar doublet. Dynamical breaking of SU(2)R induced by technifermion condensation triggers SU(2)L breaking via a portal coupling. The scale of the new strong interactions is as high as that of composite Higgs models, and the vacuum stability challenge confronting ordinary bosonic Technicolor models is avoided. Thermal or asymmetric dark matter, whose stability is ensured by a U(1)TB technibaryon symmetry, can be realized. In the latter case, the correct relic density can be reproduced for a wide range of dark matter mass via leptogenesis.
Highlights
We have proposed a novel class of extended bosonic Technicolor (bTC) models, featuring SU (2)L × SU (2)R × U (1)Y EW symmetry with an SU (2)R doublet and an SU (2)L doublet scalars, identified as the SM Higgs doublet
The compositeness scale is much larger than the EW scale, and the Higgs quartic coupling can be much larger than the SM value
That implies the models do not suffer from the problems of vacuum stability which plague ordinary bTC models
Summary
[3] models with dynamical SM fermion mass generations are challenging and complex [4,5,6,7]. In bTC models the Higgs quartic coupling at the EW scale is typically smaller than that of the SM (due to additional bTC contributions to the Higgs mass), but the top Yukawa coupling becomes larger. Different from conventional bTC models, where technifermions couple directly to H L and can modify EW observables significantly because of f < vEW, in RbTC the scale f is not directly related to v L and can be above TeV: v L (= vEW) < v R < f in regions of interest. The RbTC vacuum still preserves a global U (1)TB symmetry and the lightest composite state of technifermions charged under this U (1)TB can be electrically neutral and a DM candidate.
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