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tan β determination from heavy Higgs boson production at linear colliders

We study the production at future e+e− linear colliders of the heavy neutral Higgs bosons H and A of the minimal supersymmetric standard model in association with top and bottom quarks. The cross sections have a strong dependence on the parameter tan β, and thus provide a good way to determine it. At a linear collider with s=0.5–1 TeV and expected integrated luminosities, we find significant sensitivities for determining tan β. In the Supergravity scenario, the sensitivity is particularly strong for tan β≳10, reaching a 15% or better measurement. In the general MSSM scenario, the interplay between the 4b and 4t channels results in a good determination for tan β≲10, while the sensitivity is weakened for higher values of tan β.