Anomalous thresholds in B → (P, V)γ* form factors Article Swipe
Simon Mutke
,
Martin Hoferichter
,
Bastian Kubis
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1007/jhep07(2024)276
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1007/jhep07(2024)276
A bstract 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 $$ \mathcal{O} $$ (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.
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- en
- Landing Page
- https://doi.org/10.1007/jhep07(2024)276
- OA Status
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- 12
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- 89
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Anomalous thresholds in B → (P, V)γ* form factorsWork title
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enPrimary language
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2024Year of publication
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2024-07-30Full publication date if available
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Simon Mutke, Martin Hoferichter, Bastian KubisList of authors in order
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https://doi.org/10.1007/jhep07(2024)276Publisher landing page
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YesWhether a free full text is available
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diamondOpen access status per OpenAlex
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https://doi.org/10.1007/jhep07(2024)276Direct OA link when available
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PhysicsTop concepts (fields/topics) attached by OpenAlex
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12Total citation count in OpenAlex
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2025: 10, 2024: 2Per-year citation counts (last 5 years)
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89Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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