Dispersive $\pi \pi \to K\bar{K}$ amplitude and giant CP violation in B to three light-meson decays at LHCb

Abstract

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 $\pi \pi \to K\bar{K}$ rescattering in the final state, particularly in the 1 to 1.5 GeV region. In these analyses the $\pi \pi \to K\bar{K}$ amplitude is by default estimated from the $\pi \pi$ elastic scattering amplitude and does not describe the existing $\pi \pi \to K\bar{K}$ scattering data. Here we show how the recent model-independent dispersive analysis of $\pi \pi \to K\bar{K}$ 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.

9 pages, 6 figures. Minor corrections and discussions were added. Extended appendix with an additional improved model of the S-wave. Final version as published in Phys.Rev.Lett., where the appendix became supplemental material. Updated final values in the appendix

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Cited by in corpus (4)

• CP Violation of Baryon Decays with $N\pi$ Scatterings
• Final-state rescattering mechanism in bottom-baryon decays
• Large CP violation in charmed baryon decays
• Understanding large localized CP violation in $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$ using dispersive methods