Recherche de leptoquarks de premiére génération au sein de l'expérience D0 au Tevatron

Abstract : An evidence of the existence of leptoquarks (LQ) would prove the validity of various extensions of the Standard Model of Particle Physics (SM). The search for first-generation leptoquarks presented in this dissertation has been performed by analyzing a 1.02 fb-1 sample of data collected by the D0 detector, events with a fi?nal state comprising two light jets and two electrons. The absence of an excess of events in comparison to SM expectations leads to exclude scalar LQ masses up to 292 GeV and vector LQ masses from 350 to 458 GeV, depending on the LQ-l-q coupling type. The great importance of a good jet energy measurement motivated the study of the instrumental backgrounds correlated to the calorimeter, as much as studies ofthe hadronic showers energy resolution in photon + jets events.
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Submitted on : Monday, February 6, 2012 - 12:36:25 PM
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Anne.-Fleur. Barfuss. Recherche de leptoquarks de premiére génération au sein de l'expérience D0 au Tevatron. Physique des Hautes Energies - Expérience [hep-ex]. Université de la Méditerranée - Aix-Marseille II, 2008. Français. ⟨tel-00666686⟩

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