Charged Higgs decay to W±H at a high energy lepton collider

In this work, we present a search strategy for heavy charged Higgs boson at compact linear collider (CLIC) as a future e⁺e⁻ e + e - collider. The signal is charged Higgs boson pair production in two Higgs doublet model (2HDM) followed by H±→ W±H H ± → W ± H and H→ bb̄ H → b b ¯ . Here, H denotes the heavy CP-even neutral Higgs boson of the model. The collider center of mass energy is chosen to be √s=1400 s = 1400 GeV as the second stage of CLIC operation. In this case, mH⁺<√s/2 m H + < s / 2 can be explored due to the pair production. It is shown that the signal of charged Higgs in the mass range 250~ GeV<mH⁺< 650~ GeV 250 GeV < m H + < 650 GeV in fully hadronic final state, containing four b -jets from neutral Higgs and four jets from W bosons, can well be observed on top of the standard model background. Finally 5σ 5 σ contours are presented in (m_H±,mH) ( m H ± , m H ) space for different tan β tan β values.