Abstract
Models with three Higgs doublets (3HDM) are the source of much recent activity, for they are key components of many solutions to the problems of the Standard Model; from extra sources of CP violation to Dark Matter candidates. We compute explicitly the theoretical bounds for all symmetry-constrained 3HDM arising from the perturbative unitarity of two-to-two scattering amplitudes. In addition, we propose a method based on principal minors that foregoes diagonalization and which is preferable in all models (not only 3HDM) dealing with large scattering matrices.
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Bento, M.P., Romão, J.C. & Silva, J.P. Unitarity bounds for all symmetry-constrained 3HDMs. J. High Energ. Phys. 2022, 273 (2022). https://doi.org/10.1007/JHEP08(2022)273
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DOI: https://doi.org/10.1007/JHEP08(2022)273