Abstract
A discussion of several kinematical schemes used in the study of pion- nucleus scattering is presented. It is shown that various kinematical ambiguities of the noncovariant theories are resolved in a covariant analysis. In particular, the use of an off-mass-shell description for the projectile and the target particles provides a degree of freedom in the kinematical description which avoids various problems present in the noncovariant analyses. A comparison is made of the angle transformations, matrix elements, and differential cross sections obtained from the different kinematical specifications. In these comparisons an attempt has been made to maintain a clear separation of the dynamical and kinematical assumptions, using the same pion-nucleon interaction in the all cases considered. It is found that the large angle scattering is most sensitive to the details of the kinematical description. (AIP)
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