topness

Topness (formerly also called Truth) quantum number is the number of top quarks (t) minus the number of top anti-quarks (

\bar t

) that are present in a particle:

T = n_t - n_{\bar t}

Top quarks have a topness of +1 and anti-top quarks have a topness of −1. Topness is preserved under strong and electromagnetic interaction, but not under weak interaction. However top quark is extremely unstable, with a half life under 10^{−23^{s, which is the required time for the strong interaction to take place. For that reason top is never found to form any meson or barion: by the time it can interact strongly it has already decayed to another flavor of quark (usually to a bottom quark). See also
Isospin
Strangeness
Charm (quantum number)
Bottomness
Hypercharge

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