Nucleon resonance structure up to 2 GeV and the nature of the Roper resonance
S. Owa (CSSM and ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, University of Adelaide, South Australia 5005, Adelaide, Australia); D.B. Leinweber (CSSM, Department of Physics, University of Adelaide, South Australia 5005, Adelaide, Australia); A.W. Thomas (CSSM and ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, University of Adelaide, South Australia 5005, Adelaide, Australia)
The study of the spectrum of excited states of the nucleon is vital to our understanding of how QCD is realized in the baryon spectrum. Using a simultaneous analysis of the pion nucleon scattering data up to 2 GeV as well as the results of lattice QCD calculations, we obtain new insight into the nature of the Roper resonance as well as the excited states around 1.9 GeV.