The discovery would be a strong contender for the Nobel Prize. Last July, scientists at the European Organization for Nuclear Research, or CERN, announced finding a particle they described as Higgs-like, but they stopped short of saying conclusively that it was the same particle or was some version of it.
Scientists have now finished going through the entire set of data.
"The preliminary results with the full 2012 data set are magnificent and 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, each involving several thousand scientists.
Whether or not it is a Higgs boson is demonstrated by how it interacts with other particles and its quantum properties, CERN said in the statement. After checking, scientists said the data "strongly indicates that it is a Higgs boson."
The results were announced in a statement by the Geneva-based CERN and released at a physics conference in the Italian Alps.
CERN's atom smasher, the $10 billion Large Hadron Collider that lies beneath the Swiss-French border, has been creating high-energy collisions of protons to investigate how the universe came to be the way it is.
The particle's 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, so the theory goes, the bigger their mass will be.