Introduction

The LHC at CERN straddles the French-Swiss border and is 25 km in circumference. Protons are accelerated in opposite directions around the LHC and collide at four points. At each of these four points large detectors have been constructed to record these collisions.

The LHC itself is 100 m below the surface and superconducting magnets accelerate the protons:

The CMS (Compact Muon Solenoid) detector is a large multi-purpose detector:

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