Abstract
The concept of intrinsic parity is developed as a construct of observables within the S-matrix framework, and ambiguities arising in more conventional approaches are avoided. It is shown that invariance of transition probabilities under spatial inversion implies the existence of a set of particle intrinsic parities that is real and unique to within a gauge transformation, provided all processes not forbidden by additive conservation laws do occur in nature. If certain of the conservation laws are multiplicative, then nonreal intrinsic parities are possible. The intrinsic parity of particle-antiparticle pairs is fixed by the general Smatrix postulates to be negative for fermions and positive for bosons, a result that parallels the one of field theory. (auth)
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