Search for the standard model Higgs boson in e(+)e(-) collisions at root s=161-172 GeV
1998
This paper describes a search for the
Standard Model
Higgs bosonusing data from e(+)e(-) collisions collected at
center-of-
massenergies of 161, 170 and 172 GeV by the OPAL detector at LEP. The data collected at these energies correspond to integrated luminosities of 10.0, 1.0 and 9.4 pb(-1), respectively. The search is sensitive to the main final states from the process in which the
Higgs bosonis produced in association with a fermion anti-fermion pair, namely four jets, two jets with
missing energy. and two jets produced together with a pair of electron, muon or tau leptons. One candidate event is observed, in agreement with the
Standard Modelbackground expectation. In combination with previous OPAL searches at
center-of-
massEnergies close to the Z(0) resonance and the revised previous OPAL searches at 161 GeV, we derive a lower limit of 69.4 GeV for the mass of the
Standard Model
Higgs bosonat the 95% confidence level.
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