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<p>however, allows interactions that can alter other facets of a particle's nature described by non-dynamical, discrete quantum numbers. In particular, the action of the <a href="page.php?w=weak_interaction">weak force</a> is such that it allows the conversion of quantum numbers describing <a href="page.php?w=invariant_mass">mass</a> and <a href="page.php?w=electric_charge">electric charge</a> of both quarks and leptons from one discrete type to another. This is known as a flavour change, or flavour transmutation. Due to their quantum description,</p><p>
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