What is a top quark?

What is a top quark? Here are some definitions.

Noun
  1. (physics) A quark having a fractional electric charge of +2/3 and a mass about 178,000 MeV. Symbol: t
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I understand this is the same process by which the top quark was discovered.
My key predictions of the top quark mass and the Higgs boson mass even appeared in the pages of Nature, the most prestigious refereed science journal in the world.
I argued that the genius of the physics community would find a cheaper way to float the top quark in electric and magnetic fields long enough to take its picture.
In 1995 the Tevatron discovered the top quark, the last of the standard model's six quarks to be spotted.
Therefore the Higgs particle cannot be much heavier than the top quark.

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