Concept

Bottomness

In physics, bottomness (symbol B′ using a prime as plain B is used already for baryon number) or beauty is a flavour quantum number reflecting the difference between the number of bottom antiquarks (n_Bottom antiquark) and the number of bottom quarks (n_Bottom quark) that are present in a particle: Bottom quarks have (by convention) a bottomness of −1 while bottom antiquarks have a bottomness of +1. The convention is that the flavour quantum number sign for the quark is the same as the sign of the electric charge (symbol Q) of that quark (in this case, Q = −). As with other flavour-related quantum numbers, bottomness is preserved under strong and electromagnetic interactions, but not under weak interactions. For first-order weak reactions, it holds that . This term is rarely used. Most physicists simply refer to "the number of bottom quarks" and "the number of bottom antiquarks".

Official source

https://en.wikipedia.org/wiki/Bottomness

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