Partially composite Higgs models: Phenomenology and RG analysis

Preprint number: CP3-Origins-2017-54 DNRF90
Authors: Tommi Alanne (Max Planck Heidelberg), Mads T. Frandsen (CP3-Origins & DIAS), Diogo Buarque Franzosi (Goettingen), Mette L.A. Kristensen (CP3-Origins & DIAS), Aurora Meroni (Helsinki), and Martin Rosenlyst (CP3-Origins & DIAS)
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We study the phenomenology of partially composite-Higgs models where electroweak symmetry breaking is dynamically induced, and the Higgs is a mixture of a composite and an elementary state. The models considered have explicit realizations in terms of gauge-Yukawa theories with new strongly interacting fermions coupled to elementary scalars and allow for a very SM-like Higgs state. We study constraints on their parameter spaces from vacuum stability and perturbativity as well as from LHC results and find that requiring vacuum stability up to the compositeness scale already imposes relevant constraints. A small part of parameter space around the classically conformal limit is stable up to the Planck scale. This is however already strongly disfavored by LHC results. In different limits, the models realize both (partially) composite-Higgs and (bosonic) technicolor models and a dynamical extension of the fundamental Goldstone-Higgs model. Therefore, they provide a general framework for exploring the phenomenology of composite dynamics.