Covariance, Dynamics and Symmetries, and Hadron Form Factors

Understand

We summarise applications of Dyson-Schwinger equations to the theory and phenomenology of hadrons.

• Some exact results for pseudoscalar mesons are highlighted with details relating to the U_A(1) problem.
• We describe inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass.
• We recapitulate upon studies of nucleon electromagnetic form factors, providing a comparison of the ln-weighted ratios of Pauli and Dirac form factors for the neutron and proton.