Sep 14 – 16, 2021
University of York
Europe/Rome timezone

Continuum QCD-studies of Baryon Spectrum and Structure

Sep 16, 2021, 5:10 PM
20m
Virtual

Virtual

Invited Talk Oral Presentations

Speaker

Jorge Segovia (University Pablo de Olavide, in Seville)

Description

We present a unified QCD-based description of elastic and transition form factors involving the nucleon and its resonances. We compare predictions made using a framework built upon a Faddeev equation kernel and interaction vertices that possess QCD-like momentum dependence with results obtained using a confining, symmetry-preserving treatment of a vector ⊗ vector contact-interaction in a widely-used leading-order (rainbow-ladder) truncation of QCD’s Dyson-Schwinger equations. This comparison explains that the contact-interaction framework produces hard form factors, curtails some quark orbital angular momentum correlations within a baryon, and suppresses two-loop diagrams in the elastic and transition electromagnetic currents. Such defects are rectified in our QCD-based approach and, by contrasting the results obtained for the same observables in both theoretical schemes, shows those objects which are most sensitive to the momentum dependence of elementary quantities in QCD.

Presentation materials