In physics, bottomness symbol B′ or beauty is a flavour quantum number reflecting the difference between the number of bottom antiquarks n
and the number of bottom quarks n
that are present in a particle: B ′ = − n b − n b ¯ =-n_-n_}}
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 = −1⁄3
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 Δ B ′ = ± 1 =\pm 1}
This term is rarely used Most physicists simply refer to "the number of bottom quarks" and "the number of bottom antiquarks"
- Anchordoqui, L; Halzen, F 2009 "Lessons in Particle Physics" arXiv:09061271
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