Radiative leptonic decay B → γℓνℓ with subleading power corrections
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/E γ , 1/m b power-suppressed hard-collinear and soft Building Set corrections from higher-twist B-meson light-cone distribution amplitudes (LCDAs).The soft contribution is estimated through a