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Some particles are stable, which means if you had one in your hand, like an electron, it would just stay there. Other particles are unstable, which means if you had one of them in your hand, after a small amount of time, they would fall apart into other particles, other constituents. In some sense, out of which that particle is made. And the Higgs particle is one of the unstable particles, so if you have a Higgs particle in your hand, and a tiny fraction of a second, it decays, it falls apart into other particles. And those particles fall apart into other particles still. And the way we recognize you had a Higgs particles in your hand is not by literally seeing the Higgs particle, but by seeing this chain of events that we reconstruct by recognizing that it all began with the Higgs particle. That’s a chance to find the chain of events that leads us back to the Higgs particle as being the instigator of that chain of unfolding events.
