Charged Higgs decay to $$W^{\pm }H$$ W ± H at a high energy lepton collider

Abstract

Abstract 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 $$H^{\pm }\rightarrow W^{\pm }H$$ H ± → W ± H and $$H\rightarrow b\bar{b}$$ 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 $$\sqrt{s}=1400$$ s = 1400 GeV as the second stage of CLIC operation. In this case, $$m_{H^+}<\sqrt{s}/2$$ 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 $$250~ \text {GeV}<m_{H^+}< 650~ \text {GeV}$$ 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 $$5\sigma $$ 5 σ contours are presented in $$(m_{H^{\pm }},m_{H})$$ ( m H ± , m H ) space for different $$\tan \beta $$ tan β values.