MASS BOUNDS FOR THE NEUTRAL HIGGS BOSONS IN THE NEXT-TO-MINIMAL SUPERSYMMETRIC STANDARD MODEL

Ln the Next-To-Minimal Supersymmetric Standard Model (NMSSM), the Higg s and neutralino/chargino sectors are strongly correlated by four comm on parameters at tree level. Therefore we analyze the experimental dat a from both the search for Higgs bosons as well as for neutralinos and charginos at LEP 100 in order to constrain the parameter space and th e masses of the neutral Higgs particles in the NMSSM. We find that sma ll singlet vacuum expectation values are ruled out, but a massless neu tral Higgs scalar and pseudoscalar is not excluded for most of the par ameter space of the NMSSM. Improved limits from the neutralino/chargin o search at LEP 200, however, may lead to nonvanishing lower Higgs mas s bounds.