Form Factors from Light-Cone Sum Rules with B-Meson Distribution Amplitudes
Abstract
New sum rules for B π,K and B ,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 HQET. Employing the new light-cone sum rules we calculate the form factors at small momentum transfers, including SU(3)fl violation effects. The results agree with the predictions of the conventional light-cone sum rules.
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