A data sample corresponding to 1.23 million hadronic Z decays collected by the ALEPH detector at LEP has been searched for signals of the production of a non-minimal CP-even Higgs boson h in the reaction e+e- --> hZ*. The h decay modes considered were: those of the minimal standard model Higgs boson, with modified branching ratios; decays into a pair of CP-odd Higgs bosons A; and decays into invisible final states. Only one event was found, a very acoplanar e+e- pair which could originate from the standard model background process e+e- --> e+e-nunuBAR. Upper limits for the cross-section of the reaction e+e- --> hZ* have been derived as a function Of m(h), the mass of the Higgs boson h. In the case of invisible decays, the 95% CL lower limit on m(h) is 65 GeV/c2 for a production cross-section equal to that of a minimal standard model Higgs boson. When combined with previous ALEPH results on the reaction e+e- --> hA, these cross-section upper limits exclude a domain in the (m(h), M(A)) plane of the MSSM such that, if invisible h and A decays can be neglected, 95% CL lower limits of 44 and 21 GeV/c2 result for m(h) and m(A), respectively, independent of the other parameters of the model.
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|Titolo:||SEARCH FOR A NONMINIMAL HIGGS-BOSON PRODUCED IN THE REACTION E+E- -] HZ|
|Data di pubblicazione:||1993|
|Digital Object Identifier (DOI):||10.1016/0370-2693(93)91228-F|
|Appare nelle tipologie:||1.1 Articolo in rivista|