Abstract of my thesis 

"Search for the Standard Model Higgs Boson with the OPAL Detector at LEP II"
August 1999 (in German)

A search for the Standard Model Higgs boson using data from e+e- collisions
collected at center-of-mass energies from 161 to 184 GeV with the OPAL detector
at LEP is presented. The search is applied to events in the four-jet-channel,
in which the Higgs boson decays into a b anti-b pair and the associated Z0 decays
into quark and anti-quark.
The data analyzed corresponds to an integrated luminosity of 75.0 pb-1. 
Five candidate events are observed, in agreement with the Standard Model background 
expectation of 6.61 +/- 0.42 (stat.) +/- 1.72 (syst.) events.
A lower limit of 74.0 GeV is derived for the mass of the Standard Model Higgs boson
at the 95 % confidence level. In combination with OPAL searches in other channels a 
limit of 86.9 GeV is obtained.