The $\pi \pi$ Final State Interaction in $K\to \pi \pi$, $pp\to pp\pi \pi$ and Related Processes

M. P. Locher, V. E. Markushin, H. Q. Zheng

Final state interactions in the $S$--wave $\pi \pi$ system (I=0,2) are re-examined on the basis of the Omnès-Mus\-khe\-li\-shvili equation and the coupled channel formalism. The contrib…