Abstract
The mass of the charged Higgs boson at the 1-loop level is investigated,assuming the CP symmetry to be violated explicitly in the Higgs sector ofthe minimal supersymmetric standard model (MSSM). It is found that thereis a parameter region of the MSSM where the presence of explicit CPviolation in the Higgs sector yields negative radiative corrections to thecharged Higgs boson mass. Thus, the charged Higgs boson in the MSSM mayhave as low a mass as 60 GeV at the 1-loop level, if the CP symmetry isviolated. This lower bound may be improved by the Higgs search at LEP2,which imposes experimental constraints on the charged Higgs mass, aswell as on the masses of the neutral Higgs bosons. Hence, LEP2 canconstrain experimentally the charged Higgs mass to be not smallerthan 109 GeV under our assumption. In addition, it sets 75 GeV as thelower bound on the mass of the lightest neutral Higgs boson, and 84 GeVfor that of the next-to-lightest neutral Higgs boson.
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