Understanding large localized CP violation in $B^\pm\to K^\pmπ^+π^-$ using dispersive methods
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915900419997696 |
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| author | Heuser, L. A. Reyes-Torrecilla, A. Hanhart, C. Kubis, B. Magalhães, P. C. Mannel, T. Peláez, J. R. |
| author_facet | Heuser, L. A. Reyes-Torrecilla, A. Hanhart, C. Kubis, B. Magalhães, P. C. Mannel, T. Peláez, J. R. |
| contents | We utilize the universality of pion-pion ($ππ$) final-state interactions at small invariant masses to understand the enhanced localized CP violation in $B^\pm\to K^\pmπ^+π^-$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_10989 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Understanding large localized CP violation in $B^\pm\to K^\pmπ^+π^-$ using dispersive methods Heuser, L. A. Reyes-Torrecilla, A. Hanhart, C. Kubis, B. Magalhães, P. C. Mannel, T. Peláez, J. R. High Energy Physics - Phenomenology High Energy Physics - Experiment We utilize the universality of pion-pion ($ππ$) final-state interactions at small invariant masses to understand the enhanced localized CP violation in $B^\pm\to K^\pmπ^+π^-$, 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. |
| title | Understanding large localized CP violation in $B^\pm\to K^\pmπ^+π^-$ using dispersive methods |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.10989 |