Chew, G.F.; Low, F.E.; Unstable Particles as Targets in Scattering Experiments
Phys. Rev. 113 (1959) 1640;
A general method is suggested for analyzing the scattering of particle A by particle B, leading to three or more final particles, in order to obtain the cross section for the interaction of A with a particle which is virtually contained in B. Binding complications are absent if a plausible assumption about the location and residues of poles in the S-matrix is accepted. The method is useful for unstable particles from which free targets cannot be made; the special examples of pion and neutron targets
are discussed in detail.
Related references See also W. K. H. Panofsky and E. A. Allton, Phys. Rev. 110 (1958) 1155;
Method for extraction of pion-pion interactions.