UPPER BOUND ON THE MASS OF LIGHTEST HIGGS-BOSON IN THE SUPERSYMMETRIC SINGLET MAJORAN MODEL

We calculate an upper bound on the lightest Higgs boson mass in the supersymmetric singlet majoran model containing SU(2) x U(1) singlet right-handed neutrino fields and a chiral singlet having two units of lepton number. We show that although the singlet vacuum expectation values and supersymmetry breaking masses do not decouple from the upper bound, even at the tree level, their effect is small, thereby reducing the bound to the corresponding bound in the minimal supersymmetric standard model. Radiative corrections to the bound are similar to those in the minimal model. We also show that the couplings of the lightest Higgs boson to the majorans are suppressed in this model.