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PreprintCC BY 4.0arXiv

Electromagnetic tails of B-meson light-cone distribution amplitudes

  • Max Ferré
  • Matthias Neubert
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Abstract

We investigate electromagnetic corrections to the B-meson decay constant and light-cone distribution amplitudes (LCDAs) within the framework of heavy-quark effective theory. The inclusion of QED effects extends the support of the LCDAs to negative values of the light-cone momentum. We clarify the relation between this region and QED-generalized decay constants sensitive to electromagnetic final-state radiation. We derive model-independent expressions for the asymptotic behavior in the large negative-momentum region of the QED-generalized LCDAs Φ±(ω,μ) in terms of integrals over the two- and three-particle LCDAs defined in pure QCD. We show that our result for Φ+ is consistent with the renormalization-group equation satisfied by this object and study its evolution using the known one-loop anomalous dimension. Finally, we propose a phenomenological model consistent with these constraints

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Cite

BibTeXRIS
BibTeX
@misc{ferre2026electromagnetic,
  title = {{Electromagnetic tails of $B$-meson light-cone distribution amplitudes}},
  author = {Max Ferré and Matthias Neubert},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.01718},
  eprint = {2609.01718},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.01718},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Electromagnetic tails of B-meson light-cone distribution amplitudes
AU  - Max Ferré
AU  - Matthias Neubert
PY  - 2026
DA  - 2026/09/01
PB  - arXiv
DO  - 10.48550/arxiv.2609.01718
UR  - https://arxiv.org/abs/2609.01718
AB  - We investigate electromagnetic corrections to the B-meson decay constant and light-cone distribution amplitudes (LCDAs) within the framework of heavy-quark effective theory. The inclusion of QED effects extends the support of the LCDAs to negative values of the light-cone momentum. We clarify the relation between this region and QED-generalized decay constants sensitive to electromagnetic final-state radiation. We derive model-independent expressions for the asymptotic behavior in the large negative-momentum region of the QED-generalized LCDAs Φ_±(ω,μ) in terms of integrals over the two- and three-particle LCDAs defined in pure QCD. We show that our result for Φ_+ is consistent with the renormalization-group equation satisfied by this object and study its evolution using the known one-loop anomalous dimension. Finally, we propose a phenomenological model consistent with these constraints
ER  -