Abstract
We fit the next-to-leading order unitarity conditions to the Two-Higgs-Doublet model with a softly broken ℤ 2 symmetry. In doing so, we alleviate the existing uncertainty on how to treat higher order corrections to quartic couplings of its Higgs potential. A simplified approach to implementing the next-to-leading order unitarity conditions is presented. These new bounds are then combined with all other relevant constraints, including the complete set of LHC Run I data. The upper 95% bounds we find are 4.2 on the absolute values of the quartic couplings, and 235 GeV (100 GeV) for the mass degeneracies between the heavy Higgs particles in the type I (type II) scenario. In type II, we exclude an unbroken ℤ 2 symmetry with a probability of 95%. All fits are performed using the open-source code HEPfit.
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Cacchio, V., Chowdhury, D., Eberhardt, O. et al. Next-to-leading order unitarity fits in Two-Higgs-Doublet models with soft ℤ 2 breaking. J. High Energ. Phys. 2016, 26 (2016). https://doi.org/10.1007/JHEP11(2016)026
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DOI: https://doi.org/10.1007/JHEP11(2016)026