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The Intrinsic Parity of Elementary Particles

by: G. C. Wick, A. S. Wightman, E. P. Wigner
Physical Review Online Archive (Prola), Vol. 88, No. 1. (Oct 1952), pp. 101-105.

X Abstract

The limitations to the concept of parity of quantum-mechanical states and; in particular; of intrinsic parity of elementary particles are discussed. These limitations are shown to follow from "superselection rules;" i.e.; from restrictions on the nature and scope of possible measurements. The existence of such superselection rules is proved for the case of spinor fields; it is also conjectured that a superselection rule operates between states of different total charge.

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