|This article does not cite any references or sources. (June 2009)|
|Flavour in particle physics|
|Flavour quantum numbers:
Related quantum numbers:
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".
Like all flavour quantum numbers, topness is preserved under strong and electromagnetic interactions, but not under weak interaction. However the 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 the top quark doesn't hadronize, that is it never forms any meson or baryon, so the topness of a meson or a baryon is everytime equal at zero.. By the time it can interact strongly it has already decayed to another flavour of quark (usually to a bottom quark).
- Lessons in Particle Physics Luis Anchordoqui and Francis Halzen, University of Wisconsin, 18th Dec. 2009
|This physics-related article is a stub. You can help Wikipedia by expanding it.|