Selection Rules Implied byCPInvariance

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Abstract
Some consequences of the rigorous invariance under the product of charge conjugation and reflection are discussed. The restrictions on the interactions of real boson fields with one spinor field, and of complex boson fields with charge symmetric spinor fields are derived and compared with the restrictions implied by invariance under the separate operations. Two selection rules for transitions among such boson fields are given. Some possible applications to known particles are mentioned.