https://doi.org/10.1140/epjc/s10052-019-7572-z
Regular Article - Theoretical Physics
Sigma-assisted low scale composite Goldstone–Higgs
1
Department of Physics, Chalmers University of Technology, Fysikgården, 41296, Göteborg, Sweden
2
Université de Lyon, Univ. Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, 69622, Villeurbanne, France
* e-mail: buarque@chalmers.se
Received:
10
November
2019
Accepted:
19
December
2019
Published online:
11
January
2020
We show that the presence of a lightish scalar resonance, 
, that mixes with the composite Goldstone–Higgs boson can relax the typical bounds found in this class of models. This mechanism, inbred in models with a walking dynamics above the condensation scale, allows for a low compositeness scale 
GeV, corresponding to a misalignment angle 
, contrary to the common lore of a smaller angle. According to recent lattice results, the light emerges thanks to a near-conformal phase above the condensation scale, consistent to the requirements from flavour physics. We study this effect in a general way, showing that it appears in all cosets emerging from an underlying gauge-fermion dynamics, in the presence of top partial compositeness. The scenario is testable both on the Lattice and experimentally, as it requires the presence of a second broad Higgs-like resonance, below 1 TeV, that can be revealed at the LHC in the ZZ and 
channels.
© The Author(s), 2020
