Higgs Search at the LHC ATLAS Homepage   CMS Homepage

  Higgs Search at LEP II 

• My Doctoral thesis , the  gzipped postscript (BONN-IR 98-10)

 
• Thesis abstract

 
• Bonn University  and my  old group  at the  Physikalisches Institut

 
• Higgs Search at Bonn University

 
• Official OPAL home page 
• Higgs Candidates observed at LEPII

The Higgs Boson is the last missing ingredient of the Standard Model of elektroweak interactions. The Higgs mechanism is responsible for the elektroweak symmetry breaking. Although the Higgs Boson has not been found, indirect limits on its mass can be derived from high precision electroweak data. These fits are regularily performed by the LEP-electroweak-working-group. Direct searches at LEP I could exclude a Higgs Boson with a mass below 60 GeV. If the Higgs-Boson is not too heavy it can be produced in association with a Z-Boson at LEPII energies (the corresponding Feynman-Diagram is shown at the left.). A lower limit on the Higgs mass of 113.5 GeV could be obtained while candidate events were observed that were compatible with a Higgs of 115 GeV. The observed candidate events have a significance of about 3 sigma.