New sum rules for $B\to \pi ,K$ and $B\to \rho ,K^{*}$ form factors are derived from the correlation functions expanded near the light cone in terms of $B$-meson distribution amplitudes. The contributions of quark-antiquark and quark-antiquark-gluon components in the $B$ meson are taken into account. Models for the $B$-meson three-particle distribution amplitudes are suggested, based on QCD sum rules in heavy-quark effective theory. Employing the new light-cone sum rules, we calculate the form factors at small momentum transfers, including $SU(3)$-violation effects. The results agree with the predictions of the conventional light-cone sum rules.

• Received 29 November 2006

DOI:https://doi.org/10.1103/PhysRevD.75.054013