Next-to-leading order unitarity fits in two-Higgs-doublet models with soft \(\mathbb Z_{2}\) breaking

DOI10.1007/JHEP11(2016)026zbMATH Open1390.81012arXiv1609.01290OpenAlexW2511168807MaRDI QIDQ1636439

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Publication date: 12 June 2018

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Abstract: We fit the next-to-leading order unitarity conditions to the Two-Higgs-Doublet model with a softly broken $mathbb{Z}_2$ 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 $95\mathrm{\%}$ 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 $mathbb{Z}_2$ symmetry with a probability of $95\mathrm{\%}$. All fits are performed using the open-source code HEPfit.

Full work available at URL: https://arxiv.org/abs/1609.01290

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