Search for Sm and Mssm Higgs Bosons at Lep *

The four LEP experiments (ALEPH, DELPHI, L3 and OPAL) collected around 2.5 fb data in total at energies √ s ≥ 189 GeV of which 536 pb was registered at √ s = 206−209 GeV in 2000. The data are used to search for Higgs bosons in a variety of models. In the Standard Model (SM) the electroweak (EW) symmetry is broken via the Higgs mechanism generating the masses of elementary particles. This implies the existence of a single neutral scalar particle, the Higgs boson. While the SM is successful in describing the observed phenomena there are several theoretical arguments requiring its extension. The minimal supersymmetric (SUSY) extension of the SM (MSSM) introduces two Higgs field doublets leading to five Higgs bosons: three neutral and two charged.