Abstract
We discuss complementarity of discovery reaches of heavier neutral Higgs bosons and charged Higgs bosons at the LHC and the International Linear Collider (ILC) in two Higgs doublet models (2HDMs). We perform a comprehensive analysis on their production and decay processes for all types of Yukawa interaction under the softly-broken discrete symmetry which is introduced to avoid flavour changing neutral currents, and we investigate parameter spaces of discovering additional Higgs bosons at the ILC beyond the LHC reach. We find that the 500 GeV run of the ILC with the integrated luminosity of 500 fb−1 shows an advantage for discovering the additional Higgs bosons in the region where the LHC cannot discover them with the integrated luminosity of 300 fb−1. For the 1 TeV run of the ILC with the integrated luminosity of 1 ab−1, production processes of an additional Higgs boson associated with the top quark can be useful as discovery channels in some parameter spaces where the LHC with the integrated luminosity of 3000 fb−1 cannot reach. It is emphasized that the complementary study at the LHC and the ILC is useful not only to survey additional Higgs bosons at the TeV scale, but also to discriminate types of Yukawa interaction in the 2HDM.
Highlights
In July 2012, both the ATLAS and CMS Collaborations announced the observation of a long-sought new particle with a mass approximately at 126 GeV [1, 2]
We have studied the direct searches of additional Higgs bosons in the general 2HDM with the Z2 symmetry imposed to avoid flavour changing neutral currents (FCNCs)
We have considered the possible four types of Yukawa interaction which are determined by generic charge assignment of the Z2 parity to the standard model (SM) fermions
Summary
In July 2012, both the ATLAS and CMS Collaborations announced the observation of a long-sought new particle with a mass approximately at 126 GeV [1, 2]. For the future run of the LHC with the collision energy of 14 TeV, additional Higgs bosons are expected to be detected as long as their masses are smaller than 350 GeV to 800 GeV, depending on the scenario of the 2HDMs for the integrated luminosity of 300 fb−1 [49]. We perform a comprehensive analysis on the production and decay processes of additional Higgs bosons for all types of Yukawa interaction under the discrete symmetry. The parameter space of discovering additional Higgs bosons at the LHC is shown for all types of Yukawa interaction in the 2HDM according to the analysis given in Ref. We find that the complementary study at the LHC and the ILC is useful to survey additional Higgs bosons at the TeV scale, and to discriminate types of Yukawa interaction in the 2HDM. Φ1 Φ2 uR dR lR QL LL Type-I + − − − − + + Type-II + − − + + + + Type-X + − − − + + + Type-Y + − − + − + +
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