C-symmetry, also known as charge conjugation symmetry, refers to a fundamental symmetry in particle physics concerning the transformation of particles into their corresponding antiparticles. Specifically, it involves changing a particle into its antiparticle, which has the opposite electric charge and other quantum numbers. In terms of mathematical representation, charge conjugation transforms a particle state \(| \psi \rangle\) into its charge-conjugated state \(| \psi^C \rangle\).
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