Video explanation
A cutaway follows collision products through detector layers, then traces readout and trigger stages to show where data goes.
Different layers measure different things
Inner tracking records charged-particle paths, calorimeters measure deposited energy, and the outer muon system measures penetrating muons.
Magnetic fields and tracks
Charged particles bend in magnetic fields, with curvature related to momentum. Neutral particles do not leave the same curved tracks.
Triggers select events
The collision data volume requires trigger and acquisition systems to select events for storage. Video counters are illustrative, not current operational statistics.