Transverse momentum distributions in B-decays

We consider transverse momentum distributions in B-decays. The O(alpha (S)) coefficients for soft and collinear logarithms are computed to next-to-lea ding accuracy. Resummation. of large logarithmic contributions is performed in impact parameter space within the general formalism for transverse mome ntum distributions. It is shown that the shape-function approach as used fo r the threshold distribution case cannot be extended to the transverse mome ntum one. (C) 2001 Published by Elsevier Science B.V.