Abstract
We study the nucleon form factors and the nucleon-Δ(1232)transitions in a framework of hypercentral constituent quark model.The pion meson cloud effect is taken into account explicitly. Ourresults show that the pion cloud contributes substantially to thenucleon form factors as well as to the helicity amplitudes ofΔ(1232), and it gives an improved agreement compared to theexperimental measurement.
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