Impact of DCSB and dynamical diquark correlations on proton GPDs

Understand

We calculate the leading-twist, helicity-independent generalized parton distributions (GPDs) of the proton, at finite skewness, in the Nambu--Jona-Lasinio (NJL) model of quantum chomodynamics (QCD).

• The NJL model reproduces low-energy characteristics of QCD, including dynamical chiral symmetry breaking (DCSB).
• The proton bound-state amplitude is solved for using the Faddeev equation in a quark-diquark approximation, including both dynamical scalar and axial vector diquarks.
• GPDs are calculated using a dressed non-local correlator, consistent with DCSB, which is obtained by solving a Bethe-Salpeter equation.