Speaker
Dr
Tommi Alanne
(MPIK Heidelberg)
Description
Recently there has been revival of interest in partially composite Higgs models, where electroweak symmetry breaking is dynamically induced, and the Higgs boson is a mixture of a composite and an elementary state. While the Goldstone nature of the composite sector explains the lightness of the Higgs, the elementary scalars provide an UV completion for the SM fermion mass generation via traditional Yukawa interactions. However, in this type of models, requiring vacuum stability up to the compositeness scale already imposes relevant constraints. We study the interplay of the these constraints and the LHC results, and we find that in the minimal realisation, a small part of parameter space around the classically conformal limit is stable up to the Planck scale, but this same region is however already disfavored by LHC data. We also consider minimal extensions to alleviate these constraints. Based on PRD 96 (2017) 095012 and JHEP 1810 (2018) 051.
