Speaker
Description
Light-cone distribution amplitudes (LCDAs) parametrize the relevant hadronic information in factorization-based predictions for exclusive reactions with large energy/momentum transfer. A comprehensive theoretical understanding of these quantities is therefore essential to perform precision tests of the CKM mechanism in the Standard Model and to address currently observed flavour anomalies.
In this talk we focus on the LCDAs of heavy hadrons containing one heavy $b$-quark in the framework of heavy-quark effective theory (HQET). We explain how theoretical information about the so-called ''radiative tail'' in fixed-order perturbation theory can be consistently implemented in the construction of models or generic parametrizations of the LCDAs. As a specific example, we apply our approach to a generalized 3-particle LCDA of the $B$-meson, where the light quark and gluon field are separated along opposite light-cone directions, and briefly discuss the phenomenological relevance for rare exclusive $B$-meson decays.