DELPHI experiment

People involved

DELPHI was a detector for e+e- physics, with special emphasis on powerful particle identification , three-dimensional information, high granularity and precise vertex determination. It was installed at LEP (Large Electron and Positron collider) at CERN where it has operated between August 1989 and November 2000.

The official DELPHI homepage contains information on the detector, the physics goals and  event pictures. 

Activities at the IIHE:

Contributions to detector hardware and software

  • The Belgian laboratories (IIHE(ULB-VUB), UAUMH) have designed, constructed and maintained the 700 Forward Muon Chambers (MUF) of the DELPHI detector. This consisted of the construction of the detector itself, the development of the readout and trigger hardware and software and the development of the offline software for simulation and data reconstruction. There are Photographs of the MUF detector construction, transport and installation in Brussels and in DELPHI.
  • Some engineers in Brussels have taken responsibilities in the Central Trigger of the DELPHI experiment.
  • The DELPHI  raw data reconstruction software DELANA, and the event viewing software were partly designed and maintained by physicists of the IIHE.
  • The IIHE was also involved in the maintenance of the Surround Muon Chambers (MUS) software.

Contributions to data analysis

  • The Brussels group worked on analyses of the e+e- -> W+W- data with the aim of:
    • W mass measurement and study of colour reconnection in the fully hadronic channel (J. D'Hondt)
    • Spin Density Matrix analysis and measurement of CP-violating anomalous Triple Gauge boson Couplings (C. De Clercq, J. Lemonne).
  • the IIHE group was also involved in :
    • analysis of di-muon final states around and below the Z0 peak (Cao Fang,  Catherine De Clercq, Jacques Lemonne, Frederic Stichelbaut)
    • analysis of di-tau  final states around the Z0 peak (Daniel Bertrand, Veronique Lefébure)
    • measurement of charged Triple Gauge boson Couplings in the fully hadronic WW channel (A. Van Lysebetten)

Official DELPHI website:
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