Speaker
Description
Modern facilities, with their advanced capabilities, have enabled detailed investigations into the photo- and electro-excitation of nucleon resonances, shedding light on the evolution of their electromagnetic properties. These experimental breakthroughs have, in turn, driven significant progress in theoretical approaches.
In this seminar, I will present preliminary results on the transition form factors associated with the electro-production of the Δ(1700) resonance from the nucleon, using a vector × vector contact interaction model. This transition is governed by three key form factors: the magnetic dipole, electric quadrupole, and Coulomb quadrupole, which are often represented through helicity amplitudes. Unlike momentum-dependent interactions, our model exhibits a hard behavior but successfully encodes the dynamical breaking of chiral symmetry within the bound-state problem, resulting in numerical outcomes that align qualitatively with experimental observations. The nucleon and Δ baryons are modeled as quark-diquark bound states, with the electromagnetic transition currents derived self-consistently from the underlying QCD dynamics.
