We utilize the universality of pion-pion (𝜋𝜋) final-state interactions at small invariant masses to understand the enhanced localized 𝐶𝑃 violation in 𝐵± →𝐾±𝜋+𝜋− , using a dispersive approach. From a fit to the integrated 𝐶𝑃 -asymmetry data, we successfully predict the Dalitz-plot Kinematic distribution of the asymmetry in the low-energy 𝜋𝜋 region, including the large localized 𝐶𝑃 violation recently observed by LHCb. An essential role is played by the contributions of isospin 2. This formalism, whose parameters have a physical meaning, can be adapted straightforwardly to other systems with 𝐶𝑃 violation enhanced by final-state interactions
Heuser et al. (Thu,) studied this question.