Higgs boson: Cern scientists 'pretty sure' they found it
14 March 2013 Last updated at 12:12 GMT
Scientists at the Large Hadron Collider say the particle outlined in July 2012 looks increasingly to be a Higgs boson.
The Higgs, long theorised as the means by which particles get their mass, had been the subject of a decades-long hunt at the world's particle accelerators.
Pallab Ghosh reports.