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Theses

Search for the associated production of a single top quark and a Z or Higgs boson with the CMS experiment

Abstract : This thesis presents 4 different studies based on the data collected by CMS during the Run 2 of the LHC. Firstly, a search for the production of a single top quark and a Z boson (tZq) is conducted. This rare process probes Standard Model couplings, and may be sensitive to new physics processes. This search targets the trilepton final state and resulted in an evidence for the tZq process. A second analysis targets the production of a single top quark and a Higgs boson (tH) in multileptonfinal states. It is the only process sensitive at LO to the sign of the top quark Yukawa coupling. Constraints are placed on the value of the top quark Yukawa, and on the tH cross section. In addition, the analysis is re-adapted to search for FCNC processes with similar final states. Finally, a study of the ageing due to irradiation of the strip tracker is presented.
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Nicolas Tonon. Search for the associated production of a single top quark and a Z or Higgs boson with the CMS experiment. Physics [physics]. Université de Strasbourg, 2019. English. ⟨NNT : 2019STRAE022⟩. ⟨tel-02477118⟩

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