Abstract
The prediction of additional Higgs bosons is one of the key features of physics beyond the Standard Model (SM) that gives rise to an extended Higgs sector. We assess the sensitivity of the Large Hadron Collider (LHC) in the high luminosity (HL) run alone and in combination with a possible future International Linear Collider (ILC) to probe heavy neutral Higgs bosons. We employ the Minimal Supersymmetric Standard Model (MSSM) as a framework and assume the light mathcal {CP}-even MSSM Higgs boson to be the Higgs boson observed at 125,mathrm{GeV}. We discuss the constraints on the MSSM parameter space arising from the precision measurements of the rates of the detected signal at 125,mathrm{GeV} and from direct searches for new heavy Higgs bosons in the tau ^+tau ^-, bbar{b} and di-Higgs (hh) final states. A new benchmark scenario for heavy Higgs searches in the bbar{b} channel is proposed in this context. For the future Higgs rate measurements at the HL-LHC and ILC two different scenarios are investigated, namely the case where the future rate measurements agree with the SM prediction and the case where the rates agree with the predictions of possible realizations of the MSSM Higgs sector in nature.
Highlights
Motivated by theoretical arguments or observational puzzles, are viable in the light of the Higgs observation
In this paper we have assessed the indirect sensitivity of the high luminosity (HL)-Large Hadron Collider (LHC) for probing extended Higgs sectors via rate measurements of the observed Higgs boson at 125 GeV, alone16 and in combination with a future e+e− Higgs factory, and we have compared the indirect sensitivity with the present LHC reach and the projected HL-LHC reach for direct searches for additional heavy Higgs bosons
Concerning the projections of the rate measurements of the detected Higgs boson at 125 GeV at a future e+e− Higgs factory, we have considered for definiteness the case of the International Linear Collider (ILC) since it is the currently most advanced project, and its projected accuracies are based on full detector simulations
Summary
The MSSM [7,8,9] is one of the best studied models with an extended Higgs sector. In contrast to the case of the SM, the MSSM contains two Higgs doublet fields. In this paper we present the HL-LHC and ILC1 sensitivities to heavy Higgs bosons in the Mh125 scenario [10], in which all supersymmetric particles are heavy, leaving essentially a Two-Higgs-Doublet Model (THDM)-like Higgs sector at the electroweak scale, and the Mh125(χ ) scenario [10], which features light neutralinos and charginos. 5 we investigate constraints on BSM physics that can be obtained from the HL-LHC results in combination with precision Higgs rate measurements at the ILC In this context we analyze both the case where the future rate measurements agree with the SM prediction and the case where the rates agree with the predictions of possible realizations of the MSSM Higgs sector in nature.
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