Understanding Large Localized C P Violation in B ± → K ± π + π − Using Dispersive Methods

Physical Review Letters 2026 Open access

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Authors: Leon A. Heuser, A. Reyes-Torrecilla, C. Hanhart, Bastian Kubis, P. Camargo Magalhaes, Thomas Mannel B, José Ramón Peláez
DOI: 10.1103/l4rs-4znv
Cited by: 0
References: 65

Abstract

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.

Fields of Study & Subjects

Particle physics theoretical and experimental studies Quantum Chromodynamics and Particle Interactions High-Energy Particle Collisions Research

Publication details

Journal / source
Physical Review Letters
Volume
136
Issue
11
Pages
111901–111901
Publication date
2 February 2026
Language
EN