Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-03-21
Eur.Phys.J.C5:19-40,1998
Physics
High Energy Physics
High Energy Physics - Experiment
40 pages, LaTeX, uses a4p.sty, 13 eps figures included, submitted to Eur. Phys. J. C
Scientific paper
10.1007/s100520050245
A search is described for the neutral Higgs bosons h^0 and A^0 predicted by models with two scalar field doublets and, in particular, the Minimal Supersymmetric Standard Model (MSSM). The search in the Z^0 h^0 and h^0 A^0 production channels is based on data corresponding to an integrated luminosity of 25 pb^{-1} from e^+e^- collisions at centre-of-mass energies between 130 and 172 GeV collected with the OPAL detector at LEP. The observation of a number of candidates consistent with Standard Model background expectations is used in combination with earlier results from data collected at the Z^0 resonance to set limits on m_h and m_A in general models with two scalar field doublets and in the MSSM. For example, in the MSSM, for tan(beta) > 1, minimal and maximal scalar top quark mixing and soft SUSY-breaking masses of 1 TeV, the 95% confidence level limits m_h > 59.0 GeV and m_A > 59.5 GeV are obtained. For the first time, the MSSM parameter space is explored in a detailed scan.
et al Ackerstaff K.
The OPAL Collaboration
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