Speaker
Description
We introduce a novel symmetry-preserving approach to the physics of heavy-light mesons, which goes beyond the standard rainbow-ladder approximation. The key element of this method is the effective incorporation of flavor-dependent contributions into the Bethe-Salpeter kernel describing meson systems. These special terms originate from the quark-gluon vertices appearing in the kernel and the attendant quark-gap equation, and provide a natural distinction between "light" and "heavy" quarks. In its simplest version, this model retains only the classical tensor of the quark-gluon vertex, whose scalar form factor is considered to depend on a single kinematic variable. Then, an abelianized form of the Slavnov-Taylor identity links this form factor to the quark wave-function derived from the corresponding gap equation, allowing for the continuous transition from light to heavy quarks through the variation of the current quark mass.
