Speaker
Description
The calculation of local form factors involved in the SM predictions of semileptonic
$B$-meson decays at low-$q^2$ is a crucial ingredient in the assessment of the $B$-anomalies.
We revisit their calculation in 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 QCD perturbation theory and higher-twist contributions in the light-cone OPE. Unlike the systematic error from QHD, the magnitude of truncation errors is assessable and systematically improvable, hence allowing robust predictions of form factors.
