<p>Several extensions to the Standard Model predict the existence of charged Higgs bosons. This thesis describes the search for such a particle using the data collected by the DELPHI detector at the Large Electron Positron (LEP) collider at the European laboratory for particle physics (CERN) in Geneva, Switzerland. </p><p>In <i>e</i><sup>+</sup><i>e </i><sup>- </sup>collisions charged Higgs bosons are predicted to be produced in pairs via an intermediate photon or Z<sup>0</sup> boson. In the two Higgs doublet model (2HDM) the production cross section for a pair of charged Higgs bosons depends only on the centre of mass energy of the collision and the mass of the charged Higgs boson. </p><p>Higgs bosons decay to the heaviest particles kinematically allowed. For a charged Higgs boson with a mass that can be produced at the LEP collider this means either a <i>cs</i> quark pair or a <i>τυ</i><sub>t</sub> lepton pair. The branching ratio between these decay channels depends on the parameters of the model. </p><p>No statistically significant signal compatible with a charged Higgs boson was found. Using the predicted production cross sections from the 2HDM the existence of a charged Higgs boson with a mass lower than 73.8 GeV/<i>c</i><sup>2</sup> has been excluded at 95% confidence level independently of the decay branching ratios of the charged Higgs boson. </p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:uu-253 |
| Date | January 2001 |
| Creators | Ellert, Mattias |
| Publisher | Uppsala University, Department of Nuclear and Particle Physics, Uppsala : Acta Universitatis Upsaliensis |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Doctoral thesis, comprehensive summary, text |
| Relation | Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X ; 616 |
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