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Search for the standard model Higgs boson in \({\rm e^+e^-}\) collisions at \(\sqrt s = 161\)–172 GeV

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This paper describes a search for the Standard Model Higgs boson using data from \({\rm e^+e^-}\) collisions collected at center-of-mass energies 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 boson is 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 Model background expectation. In combination with previous OPAL searches at center-of-mass energies 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 boson at the 95% confidence level.

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Received: 19 August 1997

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The OPAL Collaboration., Ackerstaff et al., K. Search for the standard model Higgs boson in \({\rm e^+e^-}\) collisions at \(\sqrt s = 161\)–172 GeV. Eur. Phys. J. C 1, 425–438 (1998).

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