Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component

TL;DR

This paper investigates the electroproduction of the Roper resonance on the proton by modeling it as a mixture of a three-quark core and a molecular N+sigma component, comparing theoretical predictions with experimental data.

Contribution

It introduces a mixed-state model for the Roper resonance combining quark core and molecular components, and calculates electromagnetic couplings using the 3P0 and VMD models.

Findings

The mixed-state model aligns well with JLab electroproduction data.

The quark core and molecular components both significantly influence the resonance.

Electromagnetic transition contributions from vector meson cloud are quantitatively assessed.

Abstract

The Roper resonance is considered as a mixed state of a three-quark core configuration and a hadron molecular component N+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 3P0 model. The contribution of the vector meson cloud to the electromagnetic transition is given in the framework of the VMD model. Results are compared with the recent JLab electroproduction data.