La recherche des charginos et des neutralinos avec le detecteur ATLAS au LHC

Abstract : In this thesis we study the potential of the ATLAS detector at the CERN LHC for discovering supersymmetry (SUSY) in the pp->w1+z2->3l+X channel. Results are given for both low and high luminosity of the LHC. Firstly we establish that SUSY can yield a 5 sigma excess with respect to the Standard Model expectations in the inclusive trilepton topology in a large domain of the SUSY parameter space. We show that SUSY processus other than pp->w1+z2 (SUSY background) may contribute substantially to this excess. Then we refine the event selection in order to increase the purity of the pp->w1+z2->3l+X signal. This enables to study specific properties of this process. In particular we reconstruct the mass difference m(z2)-m(z1). We propose a new method to reconstruct the whole gaugino sector (this method supposes the gaugino masses unification) based on the m(z2)-m(z1) measurement. A chapter deals with the study of the space uniformity of the response of the Hamamatsu R5900 phtomultipliers used for the read-out of the ATLAS hadron calorimeter (Tilecal).
Document type :
Theses
High Energy Physics - Experiment [hep-ex]. Université Blaise Pascal - Clermont-Ferrand II, 1996. French


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Contributor : Steve Muanza <>
Submitted on : Thursday, November 17, 2005 - 5:28:29 PM
Last modification on : Thursday, November 17, 2005 - 5:28:29 PM

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  • HAL Id : tel-00011022, version 1

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Steve Muanza. La recherche des charginos et des neutralinos avec le detecteur ATLAS au LHC. High Energy Physics - Experiment [hep-ex]. Université Blaise Pascal - Clermont-Ferrand II, 1996. French. <tel-00011022>

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