An almost elementary Higgs: Theory and Practice

Abstract

We study models that interpolate between an elementary and a composite Higgs boson. Such models, arising in theories with new vector-like fermions with electro-weak quantum numbers and charged under a confining gauge interaction, are entirely compatible with current data, with only weak bounds from flavor, CP-violation and precision tests. After classifying the models from the point of view of symmetries, we study their collider phenomenology at LHC. In the most relevant scenarios, bounds from present searches exclude heavy scalar isospin triplets and quintuplets up to $\sim 200$GeV and we show how dedicated searches of simple signals such as $pp\to 3\gamma W$ could improve the reach by at least a factor of 2 with present data, reaching $O(1\mathrm{TeV})$ with higher integrated luminosities. States that mix with the SM Higgs can be tested in a variety of final states, such as $2b2\gamma$ searches relevant for double Higgs production.

arXiv comment29 pages, 9 figures. Typos corrected, references added, matches the published version

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• New physics of strong interaction and Dark Universe
• Hadronic and hadron-like physics of Dark Matter
• Loop-Generated Neutrino Masses in Composite Higgs Models
• Composite Dark Matter from Strongly-Interacting Chiral Dynamics
• Cosmological Production of Dark Nuclei
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• Coset Cosmology
• Gravitational tests of electroweak relaxation
• Models of hypercolor based on symplectic gauge group with three heavy vectorlike hyperquarks
• Stopping Dark Mesons in Their Tracks with Long-Lived Particle and Resonant Signatures