Recherche du boson de Higgs standard et non-minimal à LEP2 dans l'expérience L3

Abstract : This thesis work in the L3 collaboration Higgs working group contributed to the search for a Higgs signature, for center-of-mass energies between 192 and 209 GeV, one of the main goals of LEP2. It consists of a contribution to the analyses looking for the Standard Model Higgs boson, especially in the so-called "two jets plus missing energy" channel. The final state of this channel, denoted H_nu_nubar, is charaterized by the production of a pair of b quarks, from the decay of the Higgs particle, and a neutrino pair from that of the Z particle, the so-called Higgs-Strahlung process. The lower observed mass limit, obtained with the H_nu_nubar channel alone, is 96 GeV at a 95% confidence level.
In addition, searches for neutral scalar particle production are presented, in the context of general two-Higgs-doublet models of type II, by means of a "independent" analysis. Searches for "invisible" Higgs bosons are presented as well, with the Z boson decaying into a pair of fermions and the Higgs boson into undetectable particles. These results permit the constraining of the parameters of non-universal supersymmetric models (without gaugino mass unification).
Document type :
Theses
High Energy Physics - Experiment. Université Claude Bernard - Lyon I, 2002. French


https://tel.archives-ouvertes.fr/tel-00001929
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Submitted on : Wednesday, November 6, 2002 - 10:17:00 AM
Last modification on : Wednesday, November 6, 2002 - 10:17:00 AM

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Daniel Teyssier. Recherche du boson de Higgs standard et non-minimal à LEP2 dans l'expérience L3. High Energy Physics - Experiment. Université Claude Bernard - Lyon I, 2002. French. <tel-00001929>

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