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L 3 Experiment: Precision measurements of the standard model parameters

Electron - P ositron Collisions @ L EP.

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L 3 Experiment: Precision measurements of the standard model parameters

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  1. Electron - Positron Collisions @ LEP • LEP and the detectors ALEPH, DELPHI, L3 and OPAL were designed to investigate the parameters of the Standard Model with unprecedented precision. The L3 experiment was optimized to measure γ, e+,e- and μ+, μ-. Already in 1989, the first measurement of the Z-peak proofed the existence of three neutrino generations. Much more precise measurements did later put constraints on the masses of top-quark and Higgs particle, and did not show any hint of a deviation from the Standard Model predictions. LEP was stopped in the year 2000 to allow the construction of LHC in the same tunnel. • 1989 – 2000 • Contributing to all major subsystems, Switzerland played a significant role in construction and operation of L3. L3 Experiment:Precision measurements of the standard modelparameters 3rd Letter of Intent (L3) for an experiment at the Large Electron Positron Collider (LEP) PhysLett B 231 (1989) cm Muon Detectors L3 Cosmics Magnet • The Muon Detectors consisted of layers of multi-wire proportional chambers. ETHZ developed the laser alignment system for the barrel, and constructed the huge chambers for the forward and backward directions. • Proposed and coordinated by ETHZ, a system was added to trigger also on atmospheric muons induced by Cosmic Rays. • Construction of the huge magnet and yoke was lead by ETHZ. • Today, the same magnet is part of the ALICE detector @ LHC. Vertex Detector ECAL • Space limitations did put strong constraints on the vertex detector The wire chamber was designed and constructed by ETHZ, while UNIGE added a dedicated trigger system. Later, UNIGE and ETHZ contributed to an additional Si-strip microvertex detector. • UNIL and ETHZ contributed to the • electromagnetic calorimeter made from BGO crystals. In addition, UNIL worked on the cooling system and UNIGE on the calibration device. Hadron Calorimeter • Testing, assembly and calibration of the HCAL, made from depleted U, was done by ETHZ and PSI.

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