B-meson light-cone distribution amplitudes in the heavy-quark limit

We investigate the B-meson light-cone distribution amplitudes in the heavy- quark limit which are relevant for the QCD factorization approach for the e xclusive B-meson decays. We derive exact relations between two- and three-p article distribution amplitudes from the QCD equations of motion and heavy- quark symmetry constraint. As solution of these relations, we give represen tations for the quark-antiquark distribution amplitudes in terms of indepen dent dynamical degrees of freedom. In particular, we find that the Wandzura -Wilczek-type contributions are deter-mined uniquely in analytic form in te rms of <(<Lambda>)over bar>, a fundamental mass parameter of heavy-quark ef fective theory, and that both leading- and higher-twist distribution amplit udes receive the contributions of multiparticle states with additional gluo ns. (C) 2001 Elsevier Science B.V. All rights reserved.