Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-12-06
Phys.Atom.Nucl.61:938-951,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, LaTeX, 22 figures, presented at the 1st Int. Workshop on Non-Accelerator Physics, Dubna, July 1997, to be published
Scientific paper
The latest results of Higgs boson searches from the four LEP experiments, ALEPH, DELPHI, L3 and OPAL, are reviewed using the data taken in 1996 at center-of-mass energies between 161 and 172 GeV. No signal was observed. The 95% CL combined lower mass limit for the Minimal Standard Model (MSM) Higgs boson has increased from 66 GeV at LEP1 to 77.5 GeV with the first LEP2 data. In the framework of the Two Higgs Doublet Model, the charged Higgs boson mass limit has increased from 44 GeV to 54.5 GeV, independent of the decay branching ratio. Large new (m_h,tan_beta) and (m_h,m_A) parameter regions are excluded in the framework of the Minimal Supersymmetric extension of the Standard Model (MSSM). Preliminary results from the 1997 data-taking at 183 GeV are presented, and the prospects for a discovery in the near future are given.
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