From Bethe-Salpeter Wave Functions to Generalised Parton Distributions

Understand

We review recent works on the modelling of Generalised Parton Distributions within the Dyson-Schwinger formalism.

• We highlight how covariant computations, using the impulse approximation, allows one to fulfil most of the theoretical constraints of the GPDs.
• Specific attention is brought to chiral properties and especially the so-called soft pion theorem, and its link with the Axial-Vector Ward-Takahashi identity.
• The limitation of the impulse approximation are also explained.