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 exclusive B-meson decays. We derive exact relations between two- and three-particle distribution amplitudes from the QCD equations of motion and heavy-quark symmetry constraint. As solution of these relations, we give representations for the quark–antiquark distribution amplitudes in terms of independent dynamical degrees of freedom. In particular, we find that the Wandzura–Wilczek-type contributions are determined uniquely in analytic form in terms of Λ̄, a fundamental mass parameter of heavy-quark effective theory, and that both leading- and higher-twist distribution amplitudes receive the contributions of multiparticle states with additional gluons.