Abstract
We study how, in the heavy-quark limit and at one loop, the amplitude of the radiative decays B→γlνl,B→γγ,B→γl+l– factorise, i.e., they can be written as a convolution of a (perturbative) hard-scattering amplitude and the (nonperturbative) light-cone distribution amplitude of the B-meson. Using the framework of the Soft-Collinear Effective Theory, large logarithms can be resummed and the amplitudes of the 3 decays are shown to differ from each other only through the dynamics above M B .
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