Investigation means
High luminosity electron-positron asymmetric (with an electron beam of 9 GeV and a positron beam of 3.1 GeV) collider PEP-II.
Particle physics detector BABAR.
Computing : codes for data reconstruction, simulation, and data analysis.
Technical description
The BABAR detector was composed of five sub-detectors:
– silicon vertex detector;
– chamber for the detection of charged particles;
– Cerenkov effect detector for particle identification;
– electromagnetic calorimeter to mesure neutral particles;
– external detector for muons.
It had also a supraconductor solenoid.
Specificities
The study of CP violation in the B Meson system was possible as the collider:
- had a very high luminosity, allowing studying very rare decay modes,
- was asymmetric in energy, enabling separating the decay vertices of the two B mesons.
The particle identification detector was an innovative Cerenkov effect detector (DIRC) using the Cerenkov light reflected inside the radiator.
BABAR computing was distributed among several computing centres, including the computing centre of IN2P3 and Irfu, which is located at Lyon.
