Particle Physics Division

Investigation means

High luminosity asymmetric electron-positron collider (9 GeV electron beam and 3.1 GeV positron beam).

BABAR high energy physics detector.

Computing: data reconstruction, simulation, data analysis. 

Technical description

The BABAR detector is composed of five sub-detectors:
- silicium vertex detector;
- drift chamber to detect charged particules;
- Cerenkov detector for particle identification;
- electromagnetic calorimeter to measure neutral particules;
- external muon detector.
Il comprend également un solénoide supramagnétique. 

Specificities

 The study of CP violation in the B meson system is made possible thanks to a collider:

• of very high luminosity, giving access to very rare decay modes,
• asymmetric in energy, allowing the separation of the decay vertices of the two B mesons.

The particle identification detector (DIRC) is a new type of Cerenkov detector using the Cerenkov light which is reflected inside the radiator.