top quark

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top quark

[′täp ‚kwärk]
(particle physics)
A hypothetical quark that is postulated to have a mass of approximately 30-50 GeV, electric charge of +⅔, baryon number of ⅓, zero isotopic spin, strangeness, and charm, and a new quantum number associated with it. Also known as t quark; truth quark. Symbolized t.