Spotting the invisible

When new particles are produced in collisions, they shoot through the LHC's detectors. Different types of particle interact differently with each detector layer. Particles can only be 'seen' by the detector if they react in a way that can be measured. The detectors build up a snapshot of what's going on at each layer called an 'event image'.

But how do the detectors 'see' the smallest things that exist?
 
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Watch this video to see the size of the ATLAS detector. This five-storey-tall detector can track and identify the particles produced in collisions.
Video: ATLAS experiment. CERN

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