We have seen by now all the basic constituents of matter(quarks & leptons) along with the carriers of the basic forces (i.e.gauge bosons). But the story is not complete yet. A consistent theory of their masses requires the presence of Higgs bosons along with Supersymmetric particles, which we hope to discover at LHC. Discovery of theseparticles will also throw light on the nature of phase transition theUniverse went through a few picoseconds after its creation, and the nature of Dark Matter that permeates throughout the Universe today as a relic of that early history.
