Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866912838768918528 |
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| author | Cornella, Claudia König, Matthias Neubert, Matthias |
| author_facet | Cornella, Claudia König, Matthias Neubert, Matthias |
| contents | We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process $B^-\to\ell^-\barν_\ell$, i.e., effects probing the internal structure of the $B$ meson. The derivation requires a careful treatment of endpoint-divergent convolutions common to subleading-power factorization formulas. We find that the decay amplitude is sensitive to two- and three-particle light-cone distribution amplitudes of the $B$ meson as well as to a new hadronic parameter $F(μ,Λ)$, which generalizes the notion of the $B$-meson decay constant in the presence of QED effects. This is the first derivation of a subleading-power factorization theorem in which the soft functions are non-perturbative hadronic matrix elements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_14430 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power Cornella, Claudia König, Matthias Neubert, Matthias High Energy Physics - Phenomenology We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process $B^-\to\ell^-\barν_\ell$, i.e., effects probing the internal structure of the $B$ meson. The derivation requires a careful treatment of endpoint-divergent convolutions common to subleading-power factorization formulas. We find that the decay amplitude is sensitive to two- and three-particle light-cone distribution amplitudes of the $B$ meson as well as to a new hadronic parameter $F(μ,Λ)$, which generalizes the notion of the $B$-meson decay constant in the presence of QED effects. This is the first derivation of a subleading-power factorization theorem in which the soft functions are non-perturbative hadronic matrix elements. |
| title | Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2212.14430 |