Heavy SUSY Higgs bosons et e"+e"- linear colliders

The production mechanisms and decay modes of the heavy neutral and charged Higgs bosons in the minimal supersymmetric standard model are investigated at future e"+e"- colliders in the TeV energy regime. We generate supersymmetric particle spectra by requiring the MSSM Higgs potential to produce correct radiative electroweak symmetry breaking, and we assume a common scalar mass m_0, gaugino mass m_1_/_2 and trilinear coupling A, as well as gauge and Yukawa coupling unification at the grand unification scale. Particular emphasis is put on the low tan#beta# solution in this scenario where decays of the Higgs bosons to standard model particles compete with decays to supersymmetric charginos/neutralinos as well as fermions. In the high tan#beta# case, the supersymmetric spectrum is either too heavy or the supersymmetric decay modes are suppressed, since the Higgs bosons decay almost exclusively into b and #tau# pairs. The main production mechanisms for the heavy higgs particles are the associated AH production and H"+H"- pair production with cross sections of the order of a few fb. (orig.)39 refs.SIGLEAvailable from TIB Hannover: RA 2999(95-213) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman