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BottomnessIn Physics, Bottomness (also formerly called Beauty) quantum number is the number of bottom anti-quarks () minus the number of bottom quarks (b) that are present in a particle: -
Bottom quarks have a bottomness of −1 and bottom anti-quarks of +1, so the bottomness sign agrees with its charge ( for b). As with other flavor-related quantum numbers, bottomness is preserved under strong and electromagnetic interaction, but not under weak interaction. For firt-order weak reactions, it holds that . See also
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