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

Buskulic, D. and Finch, Alexander (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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Abstract

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.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64107
Deposited By: ep_importer_pure
Deposited On: 08 May 2013 15:20
Refereed?: Yes
Published?: Published
Last Modified: 20 Sep 2017 06:28
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64107

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