On the potential of Light-Cone Sum Rules without semi-global Quark-Hadron Duality

This work addresses the calculation of local form factors involved in the theoretical predictions of semileptonic B-meson decays at low-q^2. We present a new approach to the method of QCD Light-Cone Sum Rule with B-meson Light-Cone Distribution Amplitudes. In our strategy, we bypass the semi-global quark-hadron duality (QHD) approximation which usually contributes an unknown and potentially large systematic error to the prediction of form factors. We trade this improvement for an increased reliance on higher-order contributions in perturbation theory. Unlike the systematic error from semi-global QHD, truncation errors are assessable and systematically improvable, hence allowing robust predictions of form factors. For the transitions B→π,ρ,K^(*), our predictions agree with the literature for all form factors at q^2=0.