Two Higgs Doublet Model and model independent interpretation of neutral Higgs boson searches

  • The OPAL Collaboration
  • G. Abbiendi et al.
Experimental physics


Searches for the neutral Higgs bosons \(\mathrm{h}^0\) and \(\mathrm{A}^0\) are used to obtain limits on the Type II Two Higgs Doublet Model (2HDM(II)) with no CP–violation in the Higgs sector and no additional particles besides the five Higgs bosons. The analysis combines approximately 170 pb\(^{-1}\) of data collected with the OPAL detector at \(\sqrt{s} \approx 189\) GeV with previous runs at \(\sqrt{s} \approx m_Z\) and \(\sqrt{s} \approx 183\) GeV. The searches are sensitive to the \(\mathrm{h}^0, \mathrm{A}^0\rightarrow\mathrm{q}\bar{\mathrm{q}}, \mathrm{g}\mathrm{g}, \tau^+\tau^-\) and \(\mathrm{h}^0\rightarrow\mathrm{A}^0\mathrm{A}^0\) decay modes of the Higgs bosons. For the first time, the 2HDM(II) parameter space is explored in a detailed scan, and new flavour independent analyses are applied to examine regions in which the neutral Higgs bosons decay predominantly into light quarks or gluons. Model–independent limits are also given.


Parameter Space Higgs Boson Opal Detector Decay Mode Light Quark 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • The OPAL Collaboration
  • G. Abbiendi et al.
    • 1
  1. 1.Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy IT

Personalised recommendations