Searches for neutral Higgs bosons in e+e- collisions around √s = 189 GeV

Measurements of the trilinear gauge boson couplings WW gamma and WWZ are; presented using the data taken by DELPHI in 1998 at a centre-of-mass; energy of 189 GeV and combined with DELPHI data at 183 GeV. Values are; determined for Deltag(1)(Z) and Delta kappa (gamma), the differences of; the WWZ charge coupling and of the WWgamma dipole coupling from their; Standard Model values, and for hy, the WW gamma quadrupole coupling. A; measurement of the magnetic dipole and electric quadrupole moment of the; W is extracted from the results for Delta kappa (gamma) and lambda; (gamma). The study uses data from the final states jjl nu, jjjj, lX, jjX; and gammaX where j represents a quark jet, l an identified lepton and X; missing four-momentum. The observations are consistent with the; predictions of the Standard Model. (C) 2001 Published by Elsevier; Science B.V.

Searches for neutral Higgs bosons in the Standard Model and the MSSM have been performed using data collected by the DELPHI experiment at a centre-of-mass energy of 188.7 GeV, corresponding to an integrated luminosity of 158 pb(-1). These analyses are used, in combination with our results from lower energies, to set new 95% confidence level lower mass bounds on the Standard Model Higgs boson (94.6 GeV/c(2)) and on the lightest neutral scalar (82.6 GeV/c(2)) and neutral pseudoscalar (84.1 GeV/c(2)) Higgs bosons in a representative scan of the MSSM parameters. The results are also interpreted in the framework of a general two-Higgs doublet model.