Abstract
A flavour independent search for the CP-even and CP-odd neutral Higgs bosons h and A is performed in 624 pb−1 of data collected with the L3 detector at LEP at centre-of-mass energies between 189 and 209GeV. Higgs boson production through the e+e−→Zh and the e+e−→hA processes is considered and decays of the Higgs bosons into hadrons are studied. No significant signal is observed and 95% confidence level limits on the hZZ and hAZ couplings are derived as a function of the Higgs boson masses. Assuming the Standard Model cross section for the Higgs-strahlung process and a 100% branching fraction into hadrons, a 95% confidence level lower limit on the mass of the Higgs boson is set at 110.3 GeV.
Highlights
One of the goals of the LEP program is the search for Higgs bosons, the particles postulated by the Standard Model of the electroweak interactions [1], and some of its extensions, to explain the mechanism [2]which gives the elementary particles their observed masses. √At the centre-of-mass energies, s, at which the LEP e+e−collider was operated, the Standard ModelHiggs boson, H, is predicted to decay dominantly into b quarks
A flavour independent search for the CP-even and CP-odd neutral Higgs bosons h and A is performed in 624 pb−1 of data collected with the L3 detector at LEP at centre-of-mass energies between 189 and 209 GeV
No significant signal is observed and 95% confidence level limits on the hZZ and hAZ couplings are derived as a function of the Higgs boson masses
Summary
One of the goals of the LEP program is the search for Higgs bosons, the particles postulated by the Standard Model of the electroweak interactions [1], and some of its extensions, to explain the mechanism [2]. In some extensions of the Standard Model, decays of the Higgs bosons into bbpairs are strongly suppressed to the benefit of other decay modes such as cc, gg or τ +τ − This occurs for specific parameters of the two Higgs doublet model [10] or the MSSM [11], as well as for some composite models [12]. The hZZ and hAZ couplings relative to the HZZ coupling of the Standard Model are defined as ξ = ghZZ/gHSMZZ and η = ghAZ/gHSMZZ In the following, these couplings are not fixed to any prediction but rather considered as free parameters, reducing the model dependence of the analysis
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