Surrounding the collision point of these particles in the accelerator is a multi-layered particle detector , shown here in a cutaway view. Detectors are the sensors used by particle physicists to gather information about the particles produced by an event. Each layer of the detector senses a different property of the particles. The tracking chamber shows the paths of charged particles. The electromagnetic calorimeter collects energy from photons, electrons and positrons.
Hadrons deposit their energy in the hadron calorimeter.
Notice the large magnet in the detector. The paths of positive and negative particles curve in opposite directions. Momentum is conserved. After analyzing these event pictures, complete the following chart. Check off each column representing a detector layer where the track appears.