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Probing the Higgs coupling to the top quark at the LHC in the CMS experiment

Abstract : This thesis reports a study of the Higgs boson production in association with top quarks and decaying into τ leptons in proton-proton (pp) collisions at a center-of-mass energy of sqrt(s) = 13 TeV recorded with the CMS detector at the CERN Large Hadron Collider (LHC).This work has been carried out in the context of the Run 2 of the LHC, marked by an increase in the center-of-mass energy from 8 to 13 TeV together with an increase in the instantaneous luminosity of the collisions with respect to Run 1. To cope with this new data-taking conditions, CMS had initiated a full upgrade of the Level-1 trigger system achieved by 2016. This new system and in particular the new Level-1 electron and photon algorithm have successfully contributed to a large number of CMS results using Run 2 data. The commissioning of this new system and its performance measured with the first data collected with this new trigger are presented in details.A novel analysis technique based on the Matrix Element Method optimized for the search of the ttH, H->tautau process is also presented, including several generic tools which can be used in a large variety of H->tautau analyses. Results of the CMS analysis using this method based on 35.9 fb-1 collected in 2016 are presented. The background-only hypothesis is disfavored but not yet excluded by this analysis alone.
Keywords : Higgs Top quark Lhc Cms
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Submitted on : Wednesday, November 29, 2017 - 10:53:12 AM
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  • HAL Id : tel-01651579, version 1

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Thomas Strebler. Probing the Higgs coupling to the top quark at the LHC in the CMS experiment. High Energy Physics - Experiment [hep-ex]. Université Paris-Saclay, 2017. English. ⟨NNT : 2017SACLX044⟩. ⟨tel-01651579⟩

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