A Search for neutral Higgs bosons in the MSSM and models with two scalar field doublets

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.

Note:

40 pages, LaTeX, uses a4p.sty, 13 eps figures included, submitted to Eur. Phys. J. C Report-no: CERN-EP/98-029

electron positron: colliding beams
electron positron: annihilation
Higgs particle: search for
Higgs particle: pair production
Higgs particle: neutral particle
Higgs particle: multiplet
doublet: 2
supersymmetry: symmetry breaking
Higgs particle: decay modes
Higgs particle: mass

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Figures(0)

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