EXPERIMENTAL CONSTRAINTS ON THE PARAMETER SPACE OF THE NEXT-TO-MINIMAL SUPERSYMMETRIC STANDARD MODEL AT LEP-2

We search for the neutral Higgs sector of the next-to-minimal supersym metric standard model at LEP 2. At the tree level any experimental con straints on tan beta cannot be set by the Higgs search at LEP 2 with r oot(s) = 175 GeV, whereas at LEP 2 with root(s) = 192 GeV tan beta can be set by an experimental constraint. Furthermore the tree level para meter space of the model can be completely explored by the Higgs searc h at LEP 2 with root(s) = 205 GeV. Radiative corrections both to the n eutral Higgs boson masses and to the relevant couplings for the scalar Higgs productions give large contributions to the production cross se ctions of the scalar Higgs bosons at the tree level. The tree level si tuation at LEP 2 with root(s) = 192 GeV as well as with root(s) = 205 GeV can be drastically changed by these effects. We expect that a smal l region of the 1-loop level parameter space of the model via the scal ar Higgs production can be explored by the Higgs search at LEP 2. (C) 1997 Elsevier Science B.V.