CP asymmetries in charged meson decay to two pions
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910192658022400 |
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| author | Grossman, Yuval Ligeti, Zoltan Nir, Yosef |
| author_facet | Grossman, Yuval Ligeti, Zoltan Nir, Yosef |
| contents | We study the CP asymmetries in $B^+$, $D^+$, and $K^+$ decays into $π^+π^0$. These asymmetries are commonly known to vanish in the isospin limit. We clarify what is meant by the term ``isospin limit" in this context. We provide a unified formalism to discuss these asymmetries, and develop an understanding of how various suppression factors distinguish between them qualitatively. We estimate the size of the asymmetries in the Standard Model: $A_{CP}(B^+\toπ^+π^0)\sim 3\times10^{-3}$, $A_{CP}(D^+\toπ^+π^0)\sim 10^{-5}$, and $A_{CP}(K^+\toπ^+π^0)\sim 10^{-6}$ |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_04137 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | CP asymmetries in charged meson decay to two pions Grossman, Yuval Ligeti, Zoltan Nir, Yosef High Energy Physics - Phenomenology We study the CP asymmetries in $B^+$, $D^+$, and $K^+$ decays into $π^+π^0$. These asymmetries are commonly known to vanish in the isospin limit. We clarify what is meant by the term ``isospin limit" in this context. We provide a unified formalism to discuss these asymmetries, and develop an understanding of how various suppression factors distinguish between them qualitatively. We estimate the size of the asymmetries in the Standard Model: $A_{CP}(B^+\toπ^+π^0)\sim 3\times10^{-3}$, $A_{CP}(D^+\toπ^+π^0)\sim 10^{-5}$, and $A_{CP}(K^+\toπ^+π^0)\sim 10^{-6}$ |
| title | CP asymmetries in charged meson decay to two pions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.04137 |