Question

Which particle decays are quickest?

Answer 1

Particle decay is the spontaneous process of one unstable subatomic particle transforming into multiple other particles. ... Unstable particleswill often have multiple ways of decaying, each with its own associated probability. Decays are mediated by one or several fundamental forces.

Answer 2

Explanation:

That said, the fastest-decaying known fundamental particle known is the Z boson, followed shortly by the W boson and (theoretically) top quark, all of which have a lifetime of a fraction of a yoctosecond (about 0.26ys, 0.31ys, 0.5ys respectively).