The final elementary particle needed to complete the Standard Model of particle physics might have been discovered at the Large Hadron Collider, researchers said on Wednesday.

“This is indeed a new particle. We know it must be a boson and it’s the heaviest boson ever found,” Joe Incandela, a spokesman for the CMS experiment at the collider, said at a press conference in Geneva.

CMS and ATLAS experiments at the collider observed the new particle in the mass region of 125-165 GeV, the organization which runs the Large Hadron Collider, CERN, said on its website.

But data from the experiments, conducted in 2011-2012, are still being examined and the results will not be published until later this month, the report said.

More experiments will follow to determine the properties of the new particle, which may be the Higgs boson, possibly in one of its hypothetical variations, or some other kind of particle, the researchers said.

Higgs boson is the last undiscovered particle outlined by the Standard Model of particle physics, which explains interactions of all subatomic particles. It is one of the fundamental theories of modern physics, though it does not cover allegedly related phenomena of gravitation and dark energy, which is why it is sometimes called “the theory of almost everything.”

The Large Hadron Collider (LHC)

The Large Hadron Collider, the world’s biggest particle accelerator launched in 2008, was built with the prime goal of finding the Higgs boson, whose existence was predicted by British physicist Peter Higgs in the 1960s, or prove its absence, possibly undermining the Standard Model.