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-v v ̄. Upper limits for the cross-section of the reaction e+e- → hZ* 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 (mh mA) 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.

Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1993). Search for a non-minimal Higgs boson produced in the reaction e+e- → hZ*. PHYSICS LETTERS. SECTION B, 313(1-2), 312-325 [10.1016/0370-2693(93)91228-F].

Search for a non-minimal Higgs boson produced in the reaction e+e- → hZ*

CARPINELLI, Massimo;
1993

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 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-v v ̄. Upper limits for the cross-section of the reaction e+e- → hZ* 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 (mh mA) 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.
Articolo in rivista - Articolo scientifico
RADIATIVE-CORRECTIONS; LEP; MSSM;
English
312
325
14
Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1993). Search for a non-minimal Higgs boson produced in the reaction e+e- → hZ*. PHYSICS LETTERS. SECTION B, 313(1-2), 312-325 [10.1016/0370-2693(93)91228-F].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390415
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