Top quark is one of the elementary particles. It belongs to the third-generation quark in fermions. It is also the heaviest known elementary particle. It is only 1E-24s, which is much smaller than the time scale of strong interaction, so it decays before it is too late to form hadrons (other quarks will form hadrons). On April 25, 1994, the CDF experimental group of the Fermi experiment in the United States published evidence of the existence of top quarks. After collecting more cases, the two experimental groups CDF and DØ announced the discovery of top quarks in early 1995, which is the standard of particle physics. The last quark found in the model.
