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Charm (Quantum Number)Charm is the number of charm quarks (c) minus the number of charm anti-quarks () that are present in a particle: -
This makes charm quark to have a charm of +1 and anti-charm quark to have a charm of −1 (the charm sign agreeing with the quark charge sign). As with other flavor-related quantum numbers, charm 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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