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Theses

Mesure de la masse du quark top dans le canal dileptonique électron-muon avec la méthode des éléments de matrice dans l'expérience ATLAS auprès du LHC

Abstract : The LHC produced proton-proton collisions data with 7 TeV of center of mass energy in 2011 and 8 TeV in 2012 corresponding to an integrated luminosity of (respectively) 5 fb^{-1} and 23 fb^{-1}. Data collected by ATLAS have led to a better understanding of the detector, to the evaluation of its performance, to many measurements of physical quantities and the discovery of the \bsc{Higgs} boson. In a context of search for new physics, top quark studies are necessary as it is present in many new physics processes. The top quark mass is an important parameter of both beyond the standard model theories and the standard model itself, thus it must be measured with enough precision to be discriminatory. After a summary of the standard model and the role of the top quark, the first part of this thesis presents the ATLAS detector and focus on its electromagnetic calorimeter for which a study of the calibration constant patching process is detailed. The second part describes top quark physics events measured in ATLAS and their selection. Technical and software tools are presented. The last part presents the measurement method, from the theory to the actual measurement of the top quark mass in the dilepton electron-muon channel. This measurement yields a top quark mass of 173{,}65 \pm 0{,}70 \pm 2{,}36 GeV , showing no discrepancy with current worldwide measurements.
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Aurélien Demilly. Mesure de la masse du quark top dans le canal dileptonique électron-muon avec la méthode des éléments de matrice dans l'expérience ATLAS auprès du LHC. Physique Quantique [quant-ph]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066179⟩. ⟨tel-01142042⟩

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