Final state interaction in heavy hadron decay

Abstract

I present a critical account of the final-state interaction (FSI) in two-body B decays from viewpoint of the hadron picture. I emphasize that the phase and the magnitude of decay amplitude are related to each other by a dispersion relation. In a model phase of FSI motivated by experiment, I illustrate how much the magnitude of amplitude can deviate from its factorization value by the FSI.

Comments: 8 pages in sprocl.tex with 4 eps figures. A talk presented at the Third International Conference on B Physics and CP Violation, (Taipei, December 1999)