Eur Phys J C (2004) 33: s244-s246
https://doi.org/10.1140/epjcd/s2003-03-122-5

PS01 Heavy Flavour Physics

QCD factorisation in radiative B decays

Laboratoire de Physique Théorique, 91405 Orsay Cedex, France

Received: 14 October 2003
Accepted: 24 October 2003
Published online: 5 November 2003

Abstract

We study how, in the heavy-quark limit and at one loop, the amplitude of the radiative decays B→γℓν _ℓ,B→γ γ,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 .