Particle Zoo

The Standard Model

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The Top Quark

Symbol: t
Group: fermion, quark
Rest mass: 186 u
Diameter: 0
Charge: +2/3 e
Mean lifetime: 4.2 x 10-25 sec
Spin: 1/2
Generation: 3
Top quarks (also called truth quarks) are extremely unstable and decay almost immediately, mostly to bottom quarks and W+ bosons, even before they can form hadrons. A top quark is about as heavy as an atom of the heavy metal rhenium.



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