Dispersive Ц- KK over bar Amplitude and Giant CP Violation in B to Three Light-Meson Decays at LHCb

The LHCb collaboration has recently reported the largest CP violation effect from a single amplitude, as well as other giant CP asymmetries in several B-meson decays into three charmless light mesons. It is also claimed that this is predominantly due to 7v7v - KK over bar rescattering in the final state, particularly in the 1 to 1.5 GeV region. In these analyses the 7v7v - KK over bar amplitude is by default estimated from the 7v7v elastic scattering amplitude and does not describe the existing 7v7v - KK over bar scattering data. Here we show how the recent model-independent dispersive analysis of 7v7v - KK over bar data can be easily implemented in the LHCb formalism. This leads to a more accurate description of the asymmetry, while being consistent with the measured scattering amplitude and confirming the prominent role of hadronic final state interactions, paving the way for more elaborated analyses.