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Recherche de gluinos dans la topologie à jets de quarks b et énergie transverse manquante avec le détecteur D0 au TeVatron

Abstract : The standard model of particle physics is the model of reference to explain the subatomic phenomena. This theoretical model has been successful for about 35 years. Although it has never been directly refuted, it has some theoretical and experimental limitations at high energy. That is why several new theories are trying to propose some extensions for this model. The supersymmetry is a possible extension, which is appreciated for its theoretical neatness. The work, which is presented in this manuscript, is interested in the search for a supersymmetric signal. The main feature of this signal are the presence of four b-jets and the high transverse missing energy. This search have been performed with the Run II data collected with the D0 detector from April 2003 to March 2006 (~1 fb¬-1).
The signature of such a topology needs a good energy resolution for the jets and a precise measure of the transverse missing energy. Consequently, it is essential first to understand the informations from the calorimeter which is one of the crucial parts of the detector for such a search. The presence of the b-jets in the final state implies a efficient b-tagging. The b-tagging is a discriminant variable for the signal with respect to the standard model background. The hadronic colliders like the TeVatron are characterized by a QCD cross section which is many orders of magnitude larger than the supersymmetric signal cross section. Therefore, it is important to find fast and efficient selection cuts based on the calorimeter at the trigger level. The most important part of my work before the signal search has been dedicated on the study and the design of the trigger conditions for the jets and transverse missing energy signals.
The goal of this analysis has been to improve the actual supersymmetric
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https://tel.archives-ouvertes.fr/tel-00175297
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Submitted on : Thursday, September 27, 2007 - 3:35:37 PM
Last modification on : Tuesday, November 19, 2019 - 2:40:09 AM
Long-term archiving on: : Friday, November 25, 2016 - 6:13:22 PM

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  • HAL Id : tel-00175297, version 1

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Thomas Millet. Recherche de gluinos dans la topologie à jets de quarks b et énergie transverse manquante avec le détecteur D0 au TeVatron. Physique des Hautes Energies - Expérience [hep-ex]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00175297⟩

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