Search for a nonminimal Higgs boson produced in the reaction e+ e- -hZ*

ALEPH Collaboration (1993) Search for a nonminimal Higgs boson produced in the reaction e+ e- -hZ*. Physics Letters B, 313 (1-2). pp. 312-325. ISSN 0370-2693

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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 . 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 . Upper limits for the cross-section of the reaction have been derived as a function of mh, the mass of the Higgs boson h. In the case of invisible decays, the 95% CL lower limit on mh 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 (mhmA) 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 mh and mA, respectively, independent of the other parameters of the model.

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Journal Article
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Physics Letters B
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08 May 2013 14:20
Last Modified:
18 Sep 2023 00:41