Etude théorique et expérimentale des corrections électrofaibles au processus de production inclusive de jets. Développement de méthodes de détection de topologies extrêmes.

Abstract : We have studied the behaviour of the inclusive jet, W+jets and Z+jets processes from the phenomenological and experimental point of view in the ATLAS experiment at LHC in order to understand how important is the impact of Sudakov logarithms on electroweak corrections and in the associated production of weak vector boson and jets at LHC. We have computed the amplitude of the real electroweak corrections to the inclusive jet process due to the real emission of weak vector bosons from jets. We have done this computation with the MCFM and NLOjet++ generators at 7TeV, 8TeV and 14TeV. This study shows that, for the inclusive jet process, the partial cancellation of the virtual weak corrections (due to weak bosons in loops) by the real electroweak corrections occurs. This effect shows that Bloch-Nordsieck violation is reduced for this process. We have then participated to the measure of the differential cross-section for these different processes in the ATLAS experiment at 7TeV. In particular we have been involved into technical aspects of the measurement such as the study of the QCD background to the W+jets process in the muon channel. We have then combined the different measurements in this channel to compare their behaviour. This tends to show that several effects are giving to the electroweak corrections their relative importance as we see an increase of the relative contribution of weak bosons with jets processes to the inclusive jet process with the transverse momentum of jets, if we explicitely ask for the presence of electroweak bosons in the final state. This study is currently only a preliminary study and aims at showing that this study can be useful to investigate the underlying structure of these processes. Finally we have studied the noises affecting the ATLAS calorimeter. This has allowed for the development of a new way to detect problematic events using well known theorems from statistics. This new method is able to detect bursts of noise and problematic channels, in every circumstances, using spatial and time detection. We present this method in a dedicated chapter.
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Nicolas Meric. Etude théorique et expérimentale des corrections électrofaibles au processus de production inclusive de jets. Développement de méthodes de détection de topologies extrêmes.. Physique des Hautes Energies - Phénoménologie [hep-ph]. Université Paris-Diderot - Paris VII, 2013. Français. ⟨tel-00959427⟩

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