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Two sets of similar but heavier particles can pop into brief existence: the muon, muon neutrino, charm quark, and strange quark; and the tau, tau neutrino, top quark, and bottom quark.

Then, using the W boson mass and top quark mass, researchers made a similar prediction for the Higgs boson—which bore out spectacularly in 2012.

And the third comprises the top quark, the bottom quark, the tau and the tau neutrino, where the charged fermions are even more massive.

In June, researchers revealed that they had also seen the Higgs interact with the top quark.

In June, researchers revealed that they had also seen the Higgs interact with the top quark, the most massive known elementary particle.