Topness (symbol T) or truth is a flavour quantum number that represents the difference between the number of top quarks (t) and number of top antiquarks (t) present in a particle: T = n t − n t ¯ {\displaystyle T=n_{\text{t}}-n_{\bar {\text{t}}}} By convention, top quarks have a topness of +1 and top antiquarks have a topness of −1. The term "topness" is rarely used; most physicists simply refer to "the number of top quarks" and "the number of top antiquarks".
Topness (symbol T) or truth is a flavour quantum number that represents the difference between the number of top quarks (t) and number of top antiquarks (t) present in a particle: T = n t − n t ¯ {\displaystyle T=n_{\text{t}}-n_{\bar {\text{t}}}} By convention, top quarks have a topness of +1 and top antiquarks have a topness of −1. The term "topness" is rarely used; most physicists simply refer to "the number of top quarks" and "the number of top antiquarks".
Source: Wikipedia "Topness" · CC BY-SA 4.0
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