P. Sánchez-Puertas

The axial-vector nucleon form factor in the meson dominance picture: the role triangle singularities from a dispersive view

The nucleon axial form factor is analyzed in terms of a dispersion relation comprising chiral perturbation theory (ChPT) and perturbative QCD (pQCD) in the low- and high-momentum regimes respectively, which implies a set of superconvergence sum rules for the $A \to N \bar N$ spectral function. In the timelike region be...