Search for Neutral Higgs Bosons in e+e- Collisions at sqrt(s) ~189GeV

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dc.creatorThe OPAL collaboration
dc.creatorAbbiendo, G.
dc.date1999-07-31
dc.date.accessioned2026-07-07T12:02:34Z
dc.date.available2026-07-07T12:02:34Z
dc.descriptionA search for neutral Higgs bosons has been performed with the OPAL detector at LEP, using approximately 170 pb-1 of e+e- collision data collected at sqrt(s)~189GeV. Searches have been performed for the Standard Model (SM) process e+e- to H0Z0 and the MSSM processes e+e- to H0Z0, A0h0. The searches are sensitive to the b b-bar and tau antitau decay modes of the Higgs bosons, and also to the MSSM decay mode h0 to A0A0. OPAL search results at lower centre-of-mass energies have been incorporated in the limits we set, which are valid at the 95% confidence level. For the SM Higgs boson, we obtain a lower mass bound of 91.0 GeV. In the MSSM, our limits are mh>74.8GeV and mA>76.5GeV, assuming tan(beta)>1, that the mixing of the scalar top quarks is either zero or maximal, and that the soft SUSY-breaking masses are 1 TeV. For the case of zero scalar top mixing, we exclude values of tan(beta) between 0.72 and 2.19.
dc.description38 pages, 15 figures, submitted Euro. Phys. J. C
dc.identifierhttps://arxiv.org/abs/hep-ex/9908002
dc.identifierhttp://arxiv.org/abs/hep-ex/9908002
dc.identifierEur.Phys.J.C12:567-586,2000
dc.identifierdoi:10.1007/s100520000286
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207483
dc.subjectHigh Energy Physics - Experiment
dc.titleSearch for Neutral Higgs Bosons in e+e- Collisions at sqrt(s) ~189GeV
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