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

Abstract

In this paper, the production process e−e+→AH is analyzed in the context of the lepton-specific (or type Image 1) 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.

Keywords

• 2HDM
• Higgs Boson
• Linear Collider