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Search for Neutral Higgs Bosons in e+e- Collisions at sqrt(s) ~189GeV | | The OPAL collaboration
; G.Abbiendo
; et al
; | | Date: |
31 Jul 1999 | | Journal: | Eur.Phys.J. C12 (2000) 567-586 | | Subject: | hep-ex | | Abstract: | A 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. | | Source: | arXiv, hep-ex/9908002 | | Services: | Forum | Review | PDF | Favorites | |
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