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Study of the tri-lepton events in the Run II data of the D0 experiment at the Tevatron (FNLA, USA).

Abstract : This thesis presents the work done on the D0 experiment, one of the two detectors at the Tevatron collider situated at Fermi National Accelerator Laboratory (near Chicago, IL, USA). This thesis is devoted to the preparation of the Run II and to the analysis of the first good data (February 2002 ­ June 2002). Tri- lepton events (electron and muon) have been searched for in view of their interpretation in the framework of the Supersymmetry theory with R-parity violated by lambda coupling.
Chapter 1 reviews the Standard Model and discusses some of its problems. The theory of Super- symmetry and Supergravity, the particular Supersymmetry model used in this analysis, are presented followed by a brief list of some other Supersymmetry models that have recently been tested. Previous experimental searches for Supersymmetry are also briefly reviewed.
Chapter 2 covers the description of the Tevatron collider and the D0 detector. Algorithms and procedures for identifying particles and measuring the characteristics of events are explained in Chapter 3. Methods for identifying particles of particular interest for the present analysis as electrons and muons are described in more details in Chapter 4 and Chapter 5.
Chapter 6 describes new method for the D0 experiment to identify jets coming for the b quark hadronization. Importance of this method for the search of Supersymmetry is discussed.
Chapter 7 discusses the characteristics of the signal arising from the R-parity violated by lambda coupling and the overall strategy of the search.
The analysis of the first Run II data is discussed in Chapter 8, which describes the event selection criteria used to select candidates and reject background events, the collider data passing the selection requirements, and the background estimates with the methods used to calculate them. Chapter 9 covers a summary of the analysis and what may be expected for the future.
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Submitted on : Tuesday, December 10, 2002 - 5:12:37 PM
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Pavel Demine. Study of the tri-lepton events in the Run II data of the D0 experiment at the Tevatron (FNLA, USA).. Physique des Hautes Energies - Expérience [hep-ex]. Université Joseph-Fourier - Grenoble I, 2002. Français. ⟨tel-00002107⟩

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