The LHC provides ATLAS with 40 million collisions per second. Each collision contains 1MB of data, so we can't afford to save them all for detailed analysis.
The job of selecting the most interesting events is known as the trigger. Our group has responsibilities for two triggers:
- The trigger which selects invisible particles - including Dark Matter particles
- The trigger which selects jets from b-hadrons - the main decay product of Higgs boson decays