2018/04/13 by M. Beneke, V. M. Braun, Yao Ji +1
Physics and Astronomy · #Amplitude #Dispersion relation #Distribution (mathematics) #High-Energy Particle Collisions Research #Inverse #Particle physics theoretical and experimental studies #Photon #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Radiative transfer #Soft photon #hep-ph
paper · pdf · doi:10.1007/jhep07(2018)154
35 pages, 9 figures
arxiv created 2018/04/13 · openalex created_date 2018/04/24 · openalex publication_date 2018/07/01 · arxiv updated 2018/08/15 · openalex updated_date 2026/08/05
A bstract We reconsider the QCD predictions for the radiative decay B → γℓν ℓ with an energetic photon in the final state by taking into account the 1 /E γ , 1 /m b power-suppressed hard-collinear and soft corrections from higher-twist B -meson light-cone distribution amplitudes (LCDAs). The soft contribution is estimated through a dispersion relation and light-cone QCD sum rules. The analysis of theoretical uncertainties and the dependence of the decay form factors on the leading-twist LCDA ϕ + (ω) shows that the latter dominates. The radiative leptonic decay is therefore well suited to constrain the parameters of ϕ + (ω), including the first inverse moment, 1 / λ B , from the expected high-statistics data of the BELLE II experiment.