Study of $N(1440)$ structure via ${\gamma }^{\ast }p\to N(1440)$ transition

Abstract

We study the photoproduction of the $N(1440)$ resonance in ${\gamma }^{\ast }p\to N^{\ast }$ process in quark models, where the $N(1440)$ takes different wave functions: first radial excitation of the nucleon imported from low-lying baryon mass spectrum calculations, a general radial excitation of the nucleon, and a $q^3$ state with positive parity. The comparison between the theoretical results and experimental data on the helicity amplitudes $A_{1/2}$ and $S_{1/2}$ and the analysis of the spatial wave function of the $N(1440)$ resonance reveal that the $N(1440)$ resonance is mainly the $q^3$ first radial excitation.

6 pages, 5 figures

References in corpus (6)

• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• New results on the Roper resonance and the P_{11} partial wave
• Electroexcitation of the Roper resonance in the relativistic quark models
• The role of $q\bar{q}$ components in the N(1440) resonance
• Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component
• Pentaquark components in low-lying baryon resonances