Abstract

A search for the Minimal Standard Model Higgs boson (H 0) has been performed with data from e +e − collisions collected by the OPAL detector at LEP. The search was made for events of the types e + e −→( e + e −,μ +μ − or ν ν) H 0, H 0→ q q ̄ and was based on approximately 78 pb −1 of data taken at center-of-mass energies between 88 and 95 GeV in the years 1990–1993. The present study, combined with previous OPAL publications, excludes the existence of a Minimal Standard Model Higgs boson with mass below 56.9 GeV at the 95% confidence level.

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