The LHC Experiments 

The Large Hadron Collider will create almost a billion proton-proton collisions per second at an energy of 14 trillion electron volts. These collisions take place at four points around a 27-kilometer ring, where the four main LHC experiments—ALICE, ATLAS, CMS and LHCb—are located. Thousands of scientists around the world use the LHC experiments to investigate the nature of the physical universe. 

ATLAS event display ATLAS detector CMS detector
What is ALICE? What is ATLAS? What is CMS?
LHCb detector LHCf collaboration TOTEM component
What is LHCb? What is LHCf? What is TOTEM?