Speaker
Description
The proton leading-twist parton distribution amplitude (PDA) encodes fundamental information about the longitudinal momentum distribution of valence quarks and provides a sensitive probe of nonperturbative QCD dynamics. In particular, its shape reflects the role of quark correlations within the nucleon and offers insight into the emergence of baryon structure from QCD.
In this work, we investigate the proton PDA within a Poincaré-covariant quark--diquark framework. Particular emphasis is placed on the distinct contributions arising from scalar and axial-vector diquark correlations. Explicit expressions are obtained for the corresponding diquark distribution amplitudes and incorporated into the proton Faddeev wave function, allowing a direct analysis of how each diquark channel influences the resulting proton PDA.