Top quark
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The top quark, sometimes also referred to as the truth quark, is the most massive of all observed elementary particles. It derives its mass from its coupling to the Higgs Boson. Wikipedia
Mass: 172.76±0.3 GeV/c2
Discovery date: April 1995
Composition: elementary particle
Decays into: bottom quark (99.8%); strange quark (0.17%); down quark (0.007%)
Family: quark
Generation: third