Empirically Charting Dynamical Chiral Symmetry Breaking

We provide a snapshot of recent progress in hadron physics made using QCD’s Dyson-Schwinger equations, reviewing the generation of a quark anomalous chromomagnetic moment, which may explain the longstanding puzzle of the $a_1$-$\rho$ mass splitting, and the form of the pion and kaon valence-quark parton distribution functions.