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–Tak... hiện toàn bộ
Recently, we have shown that the continuity equation for the nuclear vector and
axial current operators acquires additional terms if the latter depend on the
energy transfer. We analyze in detail the electromagnetic single-nucleon
four-current operators and verify the validity of the modified continuity
equation for all one- and two-nucleon contributions up to fourth order in the
chiral expansion.... hiện toàn bộ