Unifying aspects of light- and heavy-systems

Dyson-Schwinger equations furnish a Poincaré covariant framework within which to study hadrons. A particular feature is the existence of a nonperturbative, symmetry preserving truncation that enables the proof of exact results. Key to the DSE’s efficacious application is their expression of the materially important momentumdependent dressing of parton propagators at infrared length-scales, which is responsible for the magnitude of constituent-quark masses and the length-scale characterising confinement in bound states. A unified quantitative description of lightand heavy-quark systems is achieved by capitalising on these features.