Particle Identification
Most particles have unique combinations of signals left in each detector sub-system, allowing different particles to be identified. For example, an electron is charged and interacts electromagnetically, so it is tracked by the tracker and then deposits all of its energy in the (electromagnetic) calorimeter. By contrast, a photon is neutral and interacts electromagnetically, so it deposits its energy in the calorimeter without leaving a track.
Read more about this topic: Hermetic Detector
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