Abstract
We reconsider the QCD predictions for the radiative decay B → γℓνℓ with an energetic photon in the final state by taking into account the 1/Eγ , 1/mb 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/λB, from the expected high-statistics data of the BELLE II experiment.
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Beneke, M., Braun, V.M., Ji, Y. et al. Radiative leptonic decay B → γℓνℓ with subleading power corrections. J. High Energ. Phys. 2018, 154 (2018). https://doi.org/10.1007/JHEP07(2018)154
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DOI: https://doi.org/10.1007/JHEP07(2018)154