Higgs boson
Each collision produces a flurry of new particles which are detected by detectors around the point where they collide. There is still only a very small chance, one in 10 billion, of a Higgs boson appearing and being detected. To find the few collisions with evidence of the Higgs boson, the LHC smashes together trillions of particles, and supercomputers sift through a massive amount of data.