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: Defined as {{mvar =}} −mvar|n}}sub| b}} + mvar|n}}sub| b̅}} ,}} where represents the number of bottom quarks and represents the number of bottom antiquarks.
* Topness (or truth) : Defined as {{mvar =}} mvar|n}}sub| t}} - mvar|n}}sub| t̅}} ,}} where represents the number of top quarks and represents the number of top antiquarks. However, because of the extremely short half-life of the top quark (predicted lifetime

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