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The Wisconsin group was very active in producing physics results with the data collected at LEP I and LEP II.  At LEP1, we were involved in a wide variety of topics, including b physics, precision electroweak measurements and tau physics.  At LEP2, we were involved in searches for Higgs bosons,  SUSY particles and for new physics with four-jet final states, as well as the measurements of the WW and ZZ cross sections. Competitive results on mass limits from ALEPH data on  Charginos, Neutralinos, Stops and Higgs from MSSM were obtained by members of our group.  The search for the neutral Higgs bosons and other new particles were among the highest priorities for the Wisconsin group at LEP II.  In fact, the high sensitivity of the ALEPH search for the Standard Model Higgs is largely due to the efforts of the Wisconsin group.

During the year 2000, the Large Electron Positron (LEP) collider was in its last year of operation and was pushed to new record energies near 209 GeV.  In that year, the Wisconsin group concentrated mainly on the important task of finding the Higgs boson in the standard model.  In August 2000, a "golden" event with extraordinary signal-like characteristics in the four-jet channel was observed in the ALEPH data by the BEHOLD! Online System, which was developed by our group to carry out the Higgs data analysis automatically as new data came in.  As the data-taking run continued into the autumn of 2000, this event was complemented with the observation of two more golden four-jet events. This was an extremely exciting development, in which many Wisconsin group members, graduate students and postdocs, played important roles. The Wisconsin group was responsible for producing and cross-checking the results published in the ALEPH publication:

"
Observation of an excess in the search for the Standard Model Higgs boson at ALEPH" Physics Letters B 495 (2000) 1.

Over the following year, the conclusions were further refined, leading to the final ALEPH Standard Model Higgs result paper:


"Final results of the searches for neutral Higgs bosons in e+e- collisions at sqrt{s} up to 209 GeV" Physics Letters B 526 (2002) 191.

We now look with optimism to the LHC experiments at CERN for the discovery of the Higgs boson, as it remains the prime motivation for present and future high energy physics programs.

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aleph at LEP1+2
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