The http://public.web.cern.ch/public/en/lhc/lhc-en.html is a high energy particle collider. It is designed to smash beams of particles (both atomic and sub-atomic particles), at very high energies, together. This collision cause the particles to split up. Scientists then anolyse the data and study the nature of sub-atomic particles.
What is the Higgs Boson?
Six scientists (including Peter Higgs) predicted the existence of this particle in 1964. It's a part of the puzzle in the Standard Model (also referred to as the Theory of Almost Everything)
A fraction of a second following the Big Bang the radiation congealed to give rise to the Higgs field. The Higgs Boson is responsible for this field. An elementary particle (not known to be made up of something smaller), the HB, essentially, gives mass to the objects in the observable universe.
http://www.bbc.co.uk/news/science-environment-18707698
Any similar experiments in the past?
Yes. The Large Electron-Positron Collider (LEP) and the Tevatron accelerator conducted searches for this particle.
What's all the fuss?
On July 4, 2012 the physicists at CERN (European Organisation for Nuclear Research) discovered a sub-atomic particle which is consistent with the Higgs Boson. There is no official confirmation that this new particle is the HB. http://press.web.cern.ch/press/PressReleases/Releases2012/PR17.12E.html
What is all the talk about 5 sigma?
Physicists use a scale to determine certainity of their finding. It relies on calculating the http://en.wikipedia.org/wiki/Standard_deviations#Basic_examples Typically, a higher sigma number is required to establish relevance (convince the scientists) for a more unpredictable or "important" discovery.
Is this the end (of theoretical physics)?
No. We've barely scratched the surface. The HB will help us understand 4% of our observable universe. The remaining portion is composed of dark matter and dark energy, which we have yet to understand.
Useful Links
http://public.web.cern.ch/public/en/About/About-en.html
http://press.web.cern.ch/press/background/B09-Important_Higgs_terms_en.html (will help you better understand articles on HB)
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