Abstract
We classify all different composite Higgs models (CHMs) characterised by the coset space \( \mathcal{G} \)/\( \mathcal{H} \) of compact semi-simple Lie groups \( \mathcal{G} \) and \( \mathcal{H} \) involving up to 13 Nambu-Goldstone bosons (NGBs), together with mild phenomenological constraints. As a byproduct of this work, we prove several simple yet, to the best of our knowledge, mostly unknown results: (1) under certain conditions, a given set of massless scalars can be UV completed into a CHM in which they arise as NGBs; (2) the set of all CHMs with a fixed number of NGBs is finite, and in particular there are 642 of them with up to 13 massless scalars (factoring out models that differ by extra U(1)’s); (3) any scalar representation of the Standard Model group can be realised within a CHM; (4) Certain symmetries of the scalar sector allowed from the IR perspective are never realised within CHMs. On top of this, we make a simple statistical analysis of the landscape of CHMs, determining the frequency of models with scalar singlets, doublets, triplets and other multiplets of the custodial group as well as their multiplicity. We also count the number of models with a symmetric coset.
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Acknowledgments
We thank Ian Low and Jose Santiago for useful discussions. This work has received financial support from grants RYC2019-027155-I (Ramón y Cajal), PID2019-106087GB-C22, PID2021-128396NB-I00 and PID2022-139466NB-C22 funded by the MCIN /AEI/ 10.13039/501100011033, “El FSE invierte en tu futuro” and “FEDER Una manera de hacer Europa”, as well as from the Junta de Andalucía grants FQM 101 and P21-00199.
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Chala, M., Fonseca, R. The landscape of composite Higgs models. J. High Energ. Phys. 2024, 17 (2024). https://doi.org/10.1007/JHEP03(2024)017
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DOI: https://doi.org/10.1007/JHEP03(2024)017