GENEVA — Scientists working at the world’s biggest atom smasher plan to announce tomorrow that they have gathered enough evidence to show that the long-sought “God particle” almost certainly does exist.

But researchers at the European Organization for Nuclear Research, or CERN, aren’t quite ready to say they’ve “discovered” the particle.

Experts familiar with the research at CERN’s $10 billion Large Hadron Collider say they will essentially show the footprint of the Higgs boson.

“You see . . . the shadow of the object, but you don’t actually see it,” explained Rob Rosen, who leads the Higgs-boson search at Fermilab in Chicago.