FINAL-STATE INTERACTIONS IN COUPLED CHANNELS OF PHYSICAL HADRONS RESULTING IN A SIZABLE, DIRECT CP-VIOLATION IN $B^0(\bar B^0)\to\pi^+\pi^-$

Abstract

We show that the large, direct CP-violation parameter Aππ=-Cππ, reported by the BELLE collaboration in the decays [Formula: see text], implies an unusual situation in which the presence of a very large difference between two strong-interaction phases (~ -110°) plays an essential role. We make the demonstration within a model of strong, two-body quasi-elastic interactions between physical hadrons. The model can accommodate a large difference between two strong-interaction phases, for which it provides a natural enhancement.