2016/10/28 by Jung, Ju-Hyun, Schweiger, Wolfgang
#FOS: Physical sciences #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1610.09242
We present a microscopic description of the strong πNN, πNΔ and πΔΔ vertices. Our starting point is a constituent-quark model supplemented by an additional 3qπ non-valence component. In the spirit of chiral constituent-quark models, quarks are allowed to emit and reabsorb a pion. This multichannel system is treated in a relativistically invariant way within the framework of point-form quantum mechanics. Starting with a common SU(6) spin-flavor-symmetric wave function for N and Δ, we calculate the strength of the πNN, πNΔ and πΔΔ couplings and the corresponding vertex form factors. Our results are in accordance with phenomenological fits of these quantities that have been obtained within purely hadronic multichannel models for baryon resonances.