Search for heavy neutral CP-even Higgs within lepton-specific 2HDM at a future linear collider

In this paper, the production process e−e+→AH is analyzed in the context of the lepton-specific (or type ) 2HDM and the question of observability of a neutral CP-even Higgs boson H at a linear collider operating at s=1 TeV is addressed. The CP-odd Higgs is assumed to experience a gauge-Higgs decay as A→ZH with hadronic decay of Z boson as the signature of signal events. The production chain is thus e+e−→AH→ZHH→jjℓℓℓℓ where ℓ is a τ or μ. Four benchmark points with different mass hypotheses are assumed for the analysis. The Higgs mass mH is assumed to vary within the range 150-300 GeV in increments of 50 GeV. The anti-kt algorithm is used to perform the jet reconstruction. Results indicate that the neutral CP-even Higgs H is observable through this production mechanism using the di-muon invariant mass distribution with possibility of mass measurement. The corresponding signal significances exceed 5σ at integrated luminosity of 3000 fb−1.