Masses and Structure of Heavy Quarkonia and Heavy-Light Mesons in a Relativistic Quark Model

Using the framework of the Covariant Spectator Theory, we calculated the masses and vertex functions of heavy and heavy-light mesons, described as quark-antiquark bound states. Our interaction kernel consists of an adjustable mixture of Lorentz scalar, pseudoscalar, and vector linear confining interactions, together with a one-gluon-exchange kernel. We performed a series of fits to the heavy and heavy-light meson spectrum, and we discuss what conclusions can be drawn from it, especially about the Lorentz structure of the kernel.