![]() It decays to a W boson and either a bottom quark (most frequently), a strange quark, or, on the rarest of occasions, a down quark. However, once produced, the top (or antitop) can decay only through the weak force. The top quark interacts with gluons of the strong interaction and is typically produced in hadron colliders via this interaction. The antiparticle of the top quark is the top antiquark (symbol: t, sometimes called antitop quark or simply antitop), which differs from it only in that some of its properties have equal magnitude but opposite sign. It has a mass of 172.76 ☐.3 GeV/ c 2, which is close to the rhenium atom mass. ![]() Like all other quarks, the top quark is a fermion with spin 1 / 2 and participates in all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The top quark was discovered in 1995 by the CDF and DØ experiments at Fermilab. This coupling y t is very close to unity in the Standard Model of particle physics, it is the largest (strongest) coupling at the scale of the weak interactions and above. It derives its mass from its coupling to the Higgs Boson. The top quark, sometimes also referred to as the truth quark, (symbol: t) is the most massive of all observed elementary particles. Makoto Kobayashi and Toshihide Maskawa (1973)
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