Quark Model Calculations of the N to Delta Reaction

TL;DR

This paper investigates the electromagnetic excitation of nucleon resonances, especially the N to Delta transition, using Constituent Quark Models to understand hadronic deformation and internal structure.

Contribution

It provides a detailed analysis of N to Delta transitions within quark models, highlighting discrepancies and implications for hadron deformation.

Findings

Discrepancies between data and theory suggest complex internal hadron dynamics.

Evidence points to possible deformation of hadronic systems.

Insights into quadrupole excitation mechanisms.

Abstract

The electromagnetic excitation of the nucleon resonances is studied in the framework of Constituent Quark Models. Particular attention is devoted to the transition to the $\Delta$ resonance and to the issue of a possible deformation of hadronic systems, mainly in connection with the problem of the quadrupole excitation. The analysis of the emerging discrepancies between data and theoretical predictions is discussed and shown to lead to important conclusions concerning the internal dynamical structure of hadrons.