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Bottomness

bottomness
In physics, bottomness symbol B′ or beauty is a flavour quantum number reflecting the difference between the number of bottom antiquarks n
b
and the number of bottom quarks n
b
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"

Further reading

  • Anchordoqui, L; Halzen, F 2009 "Lessons in Particle Physics" arXiv:09061271   

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    Bottomness beatiful post thanks!

    29.10.2014


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