Results from the N* program at JLab

TL;DR

This paper reviews experimental results from JLab's N* program, exploring nucleon excitation states and their evolution, highlighting ongoing searches for predicted but undiscovered states through advanced electromagnetic probes.

Contribution

It presents recent experimental findings on nucleon resonances and discusses ongoing efforts to discover new states using improved space-time resolution and analysis techniques.

Findings

Hints of new nucleon states from recent data

Ongoing experimental efforts with CLAS and EBAC

Awaiting final conclusions from comprehensive analyses

Abstract

We discuss the results on the fundamental degrees of freedom underlying the nucleon excitation spectrum and how they evolve as the resonance transitions are investigated with increasingly better space-time resolution of the electromagnetic probe. The search for undiscovered but predicted states continues to be pursued with a vigorous experimental program. While recent data from JLab and elsewhere provide intriguing hints of new states, final conclusions will have to wait for the results of the broad experimental effort currently underway with CLAS, and subsequent analyses involving the EBAC at JLab.