Feynman diagrams are used by particle physicists to work out the probability of interactions occurring. This powerful diagrammatic tool saves a lot of complicated quantum field theory calculations. An example (Bhabha scattering) is used to explain how to interpret Feynman diagrams.
The Higgs boson is perhaps better known by its nickname: the "God particle." Discovery of God Particle is a major breakthrough in the field of nuclea. The God Particle, I hate that name, using this is giving those religious crazies a nod.