Kinematic Corrections And Reconstruction Methods For Neutral Higgs Boson Decay To B(B)Over-Bar In 2hdm Type I At Future Lepton Colliders

In this paper, an approach for neutral Higgs boson searches is described based on 2HDM type I at electron-positron linear colliders operating at root s = 1 TeV. The beam is assumed to be unpolarized and fast detector simulation is included. The signal process produces a fully hadronic final state through e(+)e(-) -> AH -> b (b) over barb (b) over bar where both CP-even and CP-odd Higgs bosons (H and A) are assumed to decay to a pair of b-jets. Several benchmark scenarios are introduced as the baseline for the analysis taking m(H/A) in the range 150-300 GeV. In order to avoid Higgs boson conversion A -> ZH, Higgs boson masses are chosen with m(A) - m(H) < m(Z). It is shown that with a proper kinematic correction applied on final state b-jet four momenta, true combinations of b-jets can be found for simultaneous reconstruction of both Higgs bosons through b<(b)over bar> invariant mass calculation. Results show that observable signals can be achieved with statistical significance exceeding 5 sigma well before the target integrated luminosity of 8 ab(-1).