October 20, 2020 Doctoral Dissertation Open Access

Gottmann, Artur

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{
  "abstract": "<p>The nature of interactions between elementary particles nowadays is successfully described by the Standard Model of particle physics (SM), with predictions covering a wide range of observed phenomena, including the existence of the Higgs boson, discovered by two independent experiments, ATLAS and CMS. Measurements of its properties are&nbsp;compatible with the SM, however, there is strong belief to consider&nbsp;it as part of an extended Higgs sector, motivating searches for additional heavy Higgs bosons.<br>\nUntil now, measurements of properties of the observed Higgs boson, and their interpretation in models beyond the Standard Model (BSM) in the framework of effective field theories,&nbsp;are performed independently from searches for additional heavy Higgs bosons. The main topic of this thesis is to perform a unification of the two analysis approaches on the example of the H&rarr;&tau;&tau; decay channel into one, consistent, global interpretation of&nbsp;&tau;&tau; events, based on Run 2 CMS data at a centre of mass energy of 13 TeV and comprising 137 fb<sup>-1</sup>.<br>\nAt first, a&nbsp;measurement of signal strengths of the observed Higgs boson results in&nbsp;an observed (expected) significance of&nbsp;&nbsp;6.1 (5.0)&sigma;&nbsp;for gluon fusion and 1.9 (3.8)&sigma;&nbsp;for vector boson fusion production channels of the Higgs boson to ensure a good expected sensitivity to the observed&nbsp;Higgs boson. Then, a classic search for additional heavy Higgs bosons is performed, superseeding the current CMS results based on data collected in 2016. In the last step, the two analyses are combined into a consistent interpretation of&nbsp;&tau;&tau; events in the framework of BSM benchmark scenarios to demonstrate an increased sensitivity to&nbsp;deviations in scenario predictions for the BSM Higgs boson to be compatible with the observed Higgs boson, leading to an increased exclusion power on BSM benchmark scenarios.</p>", 
  "author": [
    {
      "family": "Gottmann, Artur"
    }
  ], 
  "id": "22014", 
  "issued": {
    "date-parts": [
      [
        2020, 
        10, 
        20
      ]
    ]
  }, 
  "language": "eng", 
  "title": "Global Interpretation of \u03c4\u03c4 Events in the Context of the Standard Model and Beyond", 
  "type": "thesis"
}