A naturally light Higgs without light Top Partners
Adrian Carmona, Florian Goertz

TL;DR
This paper shows that including leptons in composite Higgs models can significantly raise the allowed top partner masses, making a naturally light Higgs compatible with heavier top partners without fine-tuning.
Contribution
It introduces a minimal and natural composite Higgs model with leptons that relaxes the top partner mass bounds and avoids ultra-light top partners, using a new lepton sector realization.
Findings
Leptons can increase the top partner mass bound by over 1 TeV.
A light Higgs (100-200 GeV) is naturally compatible with heavier top partners.
Minimal lepton sector models can evade the need for ultra-light top partners.
Abstract
We demonstrate that the inclusion of a realistic lepton sector can relax significantly the upper bound on top partner masses in minimal composite Higgs models, induced by the lightness of the Higgs boson. To that extend, we present a comprehensive survey of the impact of different realizations of the fermion sectors on the Higgs potential, with a special emphasis on the role of the leptons. The non-negligible compositeness of the in a general class of models that address the flavor structure of the lepton sector and the smallness of the corresponding FCNCs, can have a significant effect on the potential. We find that, with the in the symmetric representation of , an increase in the maximally allowed mass of the lightest top partner of TeV is possible for minimal quark setups like the MCHM, without increasing the tuning. A light Higgs boson…
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