
The Lagrangian who describe all physical processes (except gravity). Pretty easy, isn’t it? Clue: “H” represents the Higgs Boson.

Particle ‘Consistent’ With Higgs Boson Discovered
The Higgs boson mediates the “Higgs field” that ultimately endows all matter with mass — finding the Higgs is therefore imperative for physicists to understand what gives the Universe substance. In other words, this discovery could lead to a whole new understanding of how the universe began.
When reports first surfaced that Peter Higgs — one of the six physicists who, in the 1960s, developed the theory behind Higgs boson — had been invited to CERN for this morning’s announcement, the event became hard to ignore: something historic was about to happen.
A helpful piece on how stuff works on “What exactly is the Higgs boson?”