Boosted light scalars decaying to b b-bar in Type-I 2HDM can be tagged as double-b fat-jets and used with SM gauge bosons to probe heavy scalars up to 540 GeV at the HL-LHC for masses 30-70 GeV.
Tree-unitarity bounds for THDM Higgs masses revisited
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abstract
We have reconsidered theoretical upper bounds on the scalar boson masses within the two-Higgs-doublet model (THDM), employing the well-known technical condition of tree-level unitarity. Our treatment provides a modest extension and generalization of some previous results of other authors. We present a rather detailed discussion of the solution of the relevant inequalities and offer some new analytic formulae as well as numerical values for the Higgs mass bounds in question. A comparison is made with the earlier results on the subject that can be found in the literature.
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hep-ph 4years
2026 4roles
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In general 2HDM potentials with two local minima, all scalar masses remain bounded under perturbativity constraints on the quartic couplings.
Exotic decays A/H to Z h_S or Z A_S exclude large regions of the type-II 2HDM+S parameter space for moderate tan beta values where conventional 2HDM channels are weak.
In real 3HDMs with spontaneous CP violation and discrete symmetry on quartics, perturbativity bounds keep new scalars near the electroweak scale despite large quadratic terms.
citing papers explorer
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Probing Boosted Light Scalars in the Type-I 2HDM
Boosted light scalars decaying to b b-bar in Type-I 2HDM can be tagged as double-b fat-jets and used with SM gauge bosons to probe heavy scalars up to 540 GeV at the HL-LHC for masses 30-70 GeV.
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On vacua and bounded masses in the general 2HDM
In general 2HDM potentials with two local minima, all scalar masses remain bounded under perturbativity constraints on the quartic couplings.
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The neutral scalars of type-II 2HDM+S under the LHC
Exotic decays A/H to Z h_S or Z A_S exclude large regions of the type-II 2HDM+S parameter space for moderate tan beta values where conventional 2HDM channels are weak.
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Light states in real 3HDMs with spontaneous CP violation and softly broken symmetries
In real 3HDMs with spontaneous CP violation and discrete symmetry on quartics, perturbativity bounds keep new scalars near the electroweak scale despite large quadratic terms.