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  • Letter
  • Open Access

Structure-dependent QED effects in exclusive B decays at subleading power

Claudia Cornella1,*, Matthias König2,†, and Matthias Neubert1,3,‡

  • 1PRISMA+ Cluster of Excellence and MITP, Johannes Gutenberg University, 55099 Mainz, Germany
  • 2Physik Department T31, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
  • 3Department of Physics and LEPP, Cornell University, Ithaca, New York 14853, USA

  • *claudia.cornella@uni-mainz.de
  • †matthias.koenig@tum.de
  • ‡matthias.neubert@uni-mainz.de

Phys. Rev. D 108, L031502 – Published 9 August, 2023Erratum Phys. Rev. D 113, 059902 (2026)

DOI: https://doi.org/10.1103/PhysRevD.108.L031502

Abstract

We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process B−→μ−ν¯μ, i.e., effects probing the internal structure of the B meson. The derivation requires a careful treatment of end-point-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 quantity F(μ,Λ), which generalizes the notion of the B-meson decay constant in the presence of QED effects. This is one of the first derivations of a subleading-power factorization theorem in which the soft functions are nonperturbative hadronic matrix elements.

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Erratum

Erratum: Structure-dependent QED effects in exclusive B decays at subleading power [Phys. Rev. D 108, L031502 (2023)]

Claudia Cornella, Matthias König, and Matthias Neubert
Phys. Rev. D 113, 059902 (2026)

Article Text

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