| Abstrakt: |
A search for neutral and charged Higgs bosons has been performed in the data collected by the DELPHI detector at centre-of-mass energies of 161 GeV and 172 GeV. The analysis assumes either the pair-production of charged Higgs bosons, ${\rm H}^{\pm}$, or the production of the lightest neutral Higgs boson, h, with either a Z or a neutral pseudoscalar Higgs boson, A. All final state topologies expected from the decay of h and A into hadrons or a pair of $\tau$ leptons, and from the decay of ${\rm H}^{\pm}$ into a pair of quarks or a $\tau \nu_{\tau}$ pair have been considered. Lower limits at the 95% confidence level have been obtained on the Higgs boson masses. The limits are 66.2 GeV/ $c^2$ for h in the Standard Model, 59.5 GeV/ $c^2$ for h and 51.0 GeV/ $c^2$ for A in the minimal supersymmetric extension of the Standard Model with sensible assumptions on the model parameters and, using the 161 GeV data only, 51.5 GeV/ $c^2$ for ${\rm H}^{\pm}$ in the general two-doublet scheme for ${\rm H}^{\pm}$ branching fractions into hadrons below 0.8. [ABSTRACT FROM AUTHOR] |
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