If they find the Higgs, then the Standard Model of physics is correct. But if they don't find it, or if they find something they didn't expect... it's back to the drawing board.
We'll find out on Wednesday 4 July when physicists gather in Melbourne for the 36th International Conference for High Energy Physics.
At 5 pm AEST on 4 July CERN will deliver the latest update in the search for the Higgs at a seminar and press conference held jointly in Geneva and Melbourne via a live two-way link.
At the Melbourne end, we'll be holding a series of briefings in the lead-up to the announcement.