دورية أكاديمية
Anomalous thresholds in B → (P, V)γ * form factors
| العنوان: | Anomalous thresholds in B → (P, V)γ * form factors |
|---|---|
| المؤلفون: | Simon Mutke, Martin Hoferichter, Bastian Kubis |
| المصدر: | Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-56 (2024) |
| بيانات النشر: | SpringerOpen, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Nuclear and particle physics. Atomic energy. Radioactivity |
| مصطلحات موضوعية: | Bottom Quarks, Flavour Symmetries, Semi-Leptonic Decays, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798 |
| الوصف: | Abstract We study the effects of anomalous thresholds on the non-local form factors describing the hadronization of the light-quark contribution to B → (P, V)γ * transitions. Starting from a comprehensive discussion of anomalous thresholds in the triangle loop function for different mass configurations, we detail how the dispersion relation for ππ intermediate states is affected by contour deformations mandated by the anomalous branch points. Phenomenological estimates of the size of the anomalous contributions to the form factors are provided with couplings determined from measured branching fractions and Dalitz plot distributions. Our key finding is that anomalous effects are suppressed on the ρ(770) resonance, while off-peak the effects can become as large as O $$ \mathcal{O} $$ (10%) of the full (light-quark-loop induced) non-local form factors. We comment on future generalizations towards higher intermediate states and the charm loop, outlining how the dispersive framework established in this work could help improve the non-local form factors needed as input for a robust interpretation of B → (P, V)ℓ + ℓ − decays. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1029-8479 |
| Relation: | https://doaj.org/toc/1029-8479 |
| DOI: | 10.1007/JHEP07(2024)276 |
| URL الوصول: | https://doaj.org/article/a50842b23e0b4e14a586598be6765f9b |
| رقم الأكسشن: | edsdoj.50842b23e0b4e14a586598be6765f9b |
| قاعدة البيانات: | Directory of Open Access Journals |
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