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-vv¯. 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.

Search for a non-minimal Higgs boson produced in the reaction e+e- --> hZ* / D., B., I., D.B., D., D., P., G., C., G., J. P., L., M. N., M., B., P., F., A., P., C., J. M., C., M., D., I., E., E., F., M., F.B., V., G., Garrido, L.l., T., M., A., P., C., P., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 313:(1993), pp. 312-325. [10.1016/0370-2693(93)91228-F]

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

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1993-01-01

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-vv¯. 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563443
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