Future e+e- colliders' sensitivity to Hbb-bar coupling and CP violation

We perform a complete simulation of the process e+e-→bb-barνν-bar, where ν can be an electron, muon, or tau neutrino, in the context of a general Higgs coupling to b quarks. We parametrize the Hbb-bar coupling as (mb/v)(a+iγ5b). Taking into account interference effects between pure Higgs and Standard Model contributions, we find that sensitivities of the order of 2% and 20% can be obtained at a future e+e- collider for deviations of the a and b parameters, respectively, from their Standard Model values. Combining our analysis with an independent measurement of ΓH can provide evidence about the CP nature of the Higgs sector