Determiningtanβfrom the SUSY Higgs sector at futuree+e−colliders

Abstract

We examine the prospects for determining $\mathrm{tan}\ensuremath{\beta}$ from heavy Higgs scalar production in the minimal supersymmetric standard model at a future ${e}^{+}{e}^{\ensuremath{-}}$ collider. Our analysis is independent of assumptions of parameter unification, and we consider general radiative corrections in the Higgs sector. Bounds are presented for $\sqrt{s}=500\mathrm{GeV}$ and 1 TeV, several Higgs boson masses, a variety of integrated luminosities and $b$-tagging efficiencies, and in scenarios with and without supersymmetric decays of the Higgs bosons. We find stringent constraints for $3\ensuremath{\lesssim}\mathrm{tan}\ensuremath{\beta}\ensuremath{\lesssim}10$ and, for some scenarios, also interesting bounds on high $\mathrm{tan}\ensuremath{\beta}$ through ${\mathrm{tbH}}^{\ifmmode\pm\else\textpm\fi{}}$ production. These bounds imply that simple Yukawa unifications may be confirmed or excluded. Implications for soft scalar mass determination and top squark parameters are also discussed.