Jorge Segovia

Argonne National Laboratory, Argonne, IL

Explanations and predictions from QCD's DSEs

The elastic and transition form factors of hadrons provide a unique window into their quark and gluon structure; giving distinctive information on the roles played by confinement and dynamical chiral symmetry breaking in quantum chromodynamics (QCD). The QCD Dyson-Schwinger equations (DSEs) have been established as a tool capable of relating these emergent phenomena with experimental observables. A contemporary application of DSEs to the study of the nucleon, delta and the transition electromagnetic form factors will be presented. Focus will be given to the "quark core" contribution and comparisons made with experimental and lattice data. Of relevance to the lattice results, we find that the delta form factors are very sensitive to m_pi and hence m_Delta. Therefore, given that the parameters which define extant simulations of lattice-regularized QCD produce Delta-resonance masses that are very large, the form factors obtained therewith are a poor guide to properties of the Delta(1232). The large-Q2 behavior of hadronic form factors and their relation to parton distribution amplitudes (PDAs) will also be discussed.

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