Abstract
Upon the absence of signals of new physics at the Large Hadron Collider, a reasonable strategy is to assume that new particles are very heavy and that the other model parameters are still unknown. In the aligned two Higgs doublet model, however, heavy Higgs boson masses above 500 GeV enhance some couplings in the scalar potential, which causes a breakdown of the perturbative unitarity in general. Some tuning among model parameters is required. We find that one piece of information on the heavy Higgs boson mass, say MH, has significant implications: (i) the other heavy Higgs bosons should have masses similar to MH within ±O(10)%; (ii) the inequalities from the theoretical constraints are practically reduced to an equation such that m 212 tan β is constant, where m 212 is the soft Z2 breaking parameter and tan β is the ratio of two vacuum expectation values; (iii) the triple Higgs coupling λHHh is constant over tan β while λHHH and λAAH are linearly proportional to tan β. The double Higgs-strahlung process of e+e− → ZHH is also studied, for which the total cross section is almost constant for a given MH.
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Cho, JH., Kim, T.Y. & Song, J. Constraints from Heavy Higgs Boson Masses in the two Higgs Doublet Model. J. Korean Phys. Soc. 73, 289–296 (2018). https://doi.org/10.3938/jkps.73.289
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DOI: https://doi.org/10.3938/jkps.73.289