Discovering the $D_0^\ast(2100)$ in $B$ semileptonic decays
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908670532517888 |
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| author | Du, M. -L. Guo, F. -K. Hanhart, C. Herren, F. Kubis, B. van Tonder, R. |
| author_facet | Du, M. -L. Guo, F. -K. Hanhart, C. Herren, F. Kubis, B. van Tonder, R. |
| contents | The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the $D_0^\ast(2300)$, are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around $2100$ MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries of $B\rightarrow D π\ell ν$ decays that allow for a direct extraction of the $Dπ$ S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish the $D_0^\ast(2100)$ using the currently available data set. We also investigate the possibility and necessary statistics of measuring the $Dπ$ isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_12133 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discovering the $D_0^\ast(2100)$ in $B$ semileptonic decays Du, M. -L. Guo, F. -K. Hanhart, C. Herren, F. Kubis, B. van Tonder, R. High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the $D_0^\ast(2300)$, are in puzzling tension with predictions from unitarized chiral perturbation theory (UChPT) and lattice QCD, which favor a lighter state at around $2100$ MeV. However, to date, no direct experimental evidence for this lighter state exists. In an effort to facilitate a direct observation, we introduce angular asymmetries of $B\rightarrow D π\ell ν$ decays that allow for a direct extraction of the $Dπ$ S-wave phase shift and discuss a novel measurement strategy for the Belle II experiment. We conduct a sensitivity study, finding that the Belle II experiment can determine the pole location with sufficient precision to firmly establish the $D_0^\ast(2100)$ using the currently available data set. We also investigate the possibility and necessary statistics of measuring the $Dπ$ isospin 1/2 scattering length with an accuracy sufficient to distinguish between the predictions from both UChPT and lattice QCD and the measurement by ALICE using femtoscopy. |
| title | Discovering the $D_0^\ast(2100)$ in $B$ semileptonic decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2509.12133 |