PS01 Heavy Flavour Physics
QCD factorisation in radiative B decays
Laboratoire de Physique Théorique, 91405 Orsay Cedex, France
Accepted: 24 October 2003
Published online: 5 November 2003
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 .
© Società Italiana di Fisica, Springer-Verlag, 2004