Reviews of the discovery last July, of a "Higgs-like" particle, confirm that it is a Higgs boson.
Scientists have now finished going through the entire set of data year and announced the results in a statement and at a physics conference in the Italian Alps.
"To me it is clear that we are dealing with a Higgs boson, though we still have a long way to go to know what kind of Higgs boson it is," said Joe Incandela, a physicist who heads one of the two main teams at CERN that each involve about 3,000 scientists.
Its existence helps confirm the theory that objects gain their size and shape when particles interact in an energy field with a key particle, the Higgs boson. The more they attract, the theory goes, the bigger their mass will be.
But, it remains an "open question," CERN said in a statement, whether this is the Higgs boson that was expected in the original formulation, or possibly the lightest of several predicted in some theories that go beyond that model.