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Recherche de particules supersymétriques se désintégrant en R-parité violée (couplage λ121) dans un état final à trois leptons, avec les données du Run II de l'expérience DØ au TeVatron

Abstract : This thesis is dedicated to the study of the first data taken by the DØ detector during the Run II of the Tevatron. Supersymmetric particles have been search for in proton-antiproton collisions, with a center of mass energy of 1.96 TeV. In the framework of supersymmetry with R-parity violation, I have studied the pair production of Gauginos, leading to a pair of LSP (neutralino 1), each one decaying into eeνμ or eμνe with a λ121 coupling. The final state contains at least two electrons : I have thus paid special attention in this work to the methods concerning identification and mis-identification of electromagnetic particles, as well as reconstruction, triggering, and correction (of the reconstructed energy). In a selection of trileptons, with at least two electrons, and some transverse missing energy, we observed 0 event in the 350 pb-1 of analyzed data, for 0,4 +0,35-0,05 (stat) ± 0,16 (sys) expected from the Standard Model contributions. In the signal considered in this analysis, the selection efficiency is around 12%. Results have been studied in two models : mSUGRA and MSSM. In mSUGRA model, limits on m1/2 and lightest gauginos's masses have been obtained, with tanβ = 5, A0 = 0, m0 = 100 and 1000 GeV.c-2 and both signs of μ. In MSSM, with the hypothesis of massive sfermions (1000 GeV.c-2), we can exclude, at 95% Confidence Level, the region mchargino1 > 200 GeV.c-2, for all masses of neutralino 1 LSP.
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https://tel.archives-ouvertes.fr/tel-00010520
Contributor : Anne-Marie Magnan <>
Submitted on : Wednesday, October 12, 2005 - 5:16:42 PM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:22:17 PM

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Anne-Marie Magnan. Recherche de particules supersymétriques se désintégrant en R-parité violée (couplage λ121) dans un état final à trois leptons, avec les données du Run II de l'expérience DØ au TeVatron. Physique des Hautes Energies - Expérience [hep-ex]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00010520⟩

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