| Abstract: | The arguments for baryon parity doubling are re-examined by use of a spin formalism developed by the author together with B. E. LAURENT . It is shown that the transformation between good parity amplitudes and helicity flip and non-flip amplitudes in πN scattering is ambiguous. It is further shown that the unitary condition for boson-fermion scattering gives no information of the parity of intermediate states contributing to a good parity amplitude. These ambiguities follow from the fact that for boson-fermion scattering the CPT transformation of an amplitude does not commute with the projection on a definite parity. It is finally shown how a Regge pole model with linear trajectories without parity doubling can be constructed without any specific dynamical assumptions or artifices. The constraints on the residues needed in this case do not violate any general principles. |
