Final-state rescattering mechanism in bottom-baryon decays
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911177124085760 |
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| author | Duan, Zhu-Ding Wang, Jian-Peng Li, Run-Hui Lv, Cai-Dian Yu, Fu-Sheng |
| author_facet | Duan, Zhu-Ding Wang, Jian-Peng Li, Run-Hui Lv, Cai-Dian Yu, Fu-Sheng |
| contents | The first observation of $CP$ violation in baryon decays was recently reported by the LHCb collaboration in $Λ_b^0\to pK^-π^+π^-$ with $A_{CP} = (2.45 \pm 0.46 \pm 0.10)\%$, which inspires the study on baryon non-leptonic decays. In this work, we perform the first calculation of five exclusive non-leptonic decays, $Λ^{0}_{b}\to pπ^{-}, p K^{-},pρ^{-},pK^{*-}$ and $Λϕ$, within the re-scattering approach. The triangle diagrams at hadron level are calculated in form of loop integrations. It leads to the generation of strong phases, which is essential to the calculation of $CP$ asymmetries. We present numerical results for branching ratios, direct and partial-wave $CP$ asymmetries, decay asymmetry parameters and their associated $CP$ asymmetries. Our results are consistent with the current LHCb experimental data, which indicates the validity and potential of our approach in studying the $CP$ asymmetries of $b$-baryon decays. Most of our results are expected to be tested in future experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_20458 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Final-state rescattering mechanism in bottom-baryon decays Duan, Zhu-Ding Wang, Jian-Peng Li, Run-Hui Lv, Cai-Dian Yu, Fu-Sheng High Energy Physics - Phenomenology The first observation of $CP$ violation in baryon decays was recently reported by the LHCb collaboration in $Λ_b^0\to pK^-π^+π^-$ with $A_{CP} = (2.45 \pm 0.46 \pm 0.10)\%$, which inspires the study on baryon non-leptonic decays. In this work, we perform the first calculation of five exclusive non-leptonic decays, $Λ^{0}_{b}\to pπ^{-}, p K^{-},pρ^{-},pK^{*-}$ and $Λϕ$, within the re-scattering approach. The triangle diagrams at hadron level are calculated in form of loop integrations. It leads to the generation of strong phases, which is essential to the calculation of $CP$ asymmetries. We present numerical results for branching ratios, direct and partial-wave $CP$ asymmetries, decay asymmetry parameters and their associated $CP$ asymmetries. Our results are consistent with the current LHCb experimental data, which indicates the validity and potential of our approach in studying the $CP$ asymmetries of $b$-baryon decays. Most of our results are expected to be tested in future experiments. |
| title | Final-state rescattering mechanism in bottom-baryon decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2412.20458 |