Electroproduction of the Roper resonance on the proton: The role of the three-quark core and the molecular<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mi>σ</mml:mi></mml:math>component

Abstract

The Roper resonance is considered as a mixed state of a three-quark core configuration and a hadron-molecular component $N+\ensuremath{\sigma}$. Based on this ansatz we study electroproduction of the Roper resonance. The strong and electromagnetic couplings induced by the quark core are calculated in the $^{3}P_{0}$ model. The contribution of the vector-meson cloud to the electromagnetic transition is given in the framework of the vector-meson dominance model. Results are compared with the recent JLab electroproduction data.