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Recherche de supersymetrie dans les canaux avec un ou deux leptons avec le detecteur L3 a LEP

Abstract : The present thesis presents two different acpects of my work in the L3 experiment, which are
on one side the search for supersymmetric particles, the scalar leptons, in two different topologies :
" electron + X + Ebar " and " 2 leptons + 2 photons + Ebar ", each of them being related to two theoretical SUSY models, m-SUGRA and GMSB. On the other side my work has been completed by
the study of the BGO cristal electromagnetic calorimeter of L3, and the calibration of the electromagnetic calorimeter EGAP. After the essential motivations being reviewed, the production and
desintegration modes are detailled concerning the scalar lepton sector at LEP. Then one presents
the analysis techniques which I used to perform my selection, and also the results obtained from the
data collected by L3 for center of mass energies between 183 GeV and 202 GeV. The selection
criteria that allow to isolate the events I looked for, including efficiencies but also the background
rate coming from Standard Model that one can expect are presented. The final interpretations of
those results in both frameworks of m-SUGRA and GMSB are detailled at the end of this thesis.
I took benefit of those results to derive some limits on the masses of the scalar leptons that do
not depend on the free parameters of the SUSY models, especially on the selectron mass in the
framework of m-SUGRA: M > 71:2 GeV
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Submitted on : Monday, February 4, 2002 - 11:20:49 AM
Last modification on : Friday, November 6, 2020 - 3:29:53 AM
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  • HAL Id : tel-00001082, version 1



Arnaud Balandras. Recherche de supersymetrie dans les canaux avec un ou deux leptons avec le detecteur L3 a LEP. Physique des Hautes Energies - Expérience [hep-ex]. Université de Savoie, 2000. Français. ⟨tel-00001082⟩



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