...is the theory.
I love science.
Here's the short version (from the telegraph article):
[The] physicists in charge of the Large Hadron Collider said that they had only established where the Higgs boson was not to be found, and that its location continues to elude them. However they added that as the amount of data created by the atom-smashing experiments increases, they now expect to know whether or not the most-wanted particle exists within 18 months.
[The Higgs Boson] was first postulated by the Scottish physicist Peter Higgs in 1964 as part of the Standard Model of physics, as an invisible field that gives mass to particles, but remains theoretical.
Long version here -> http://www.telegraph.co.uk/science/large-hadron-collider/8660551/Existence-of-God-particle-to-be-decided-by-next-year.html