Observability of 2HDM charged Higgs boson in a misaligned scenario

Abstract

The large hadron collider precision measurement of $h_{125}$ properties suggests that a misaligned two Higgs doublet model type 1 is preferred among other types of the model. In this analysis, a lepton collider potential for charged Higgs boson observation is evaluated and compared with HL-LHC expectations. We focus on $H^{\pm }\to W^{\pm }{h}_{125}$ decay which is exclusively activated in misalignment scenario. An event analysis including fast detector simulation is performed and it is shown that some parts of the parameter space which are out of HL-LHC reach can be probed by a high energy lepton collider with signal significance exceeding $2\sigma$ and $5\sigma$ for exclusion or discovery. The region with highest sensitivity is in the middle range charged Higgs boson mass, i.e., $350<m_{H^{\pm }}<450$ GeV and $\tan \beta \gtrsim 4$ at non-zero $\cos (\beta -\alpha )$ values.

21 pages, 24 figures, version to appear in PRD

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