Evidence for a spin-quartet of nucleon resonances at 2\,GeV

Details Evidence for a spin-quartet of nucleon resonances at 2\,GeV Evidence for a spin-quartet of nucleon resonances at 2\,GeV

2011-11-26

arxiv.org/abs/1111.6150v2

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 3 figures, 3 tables, reanalysis with improved errors

Scientific paper

Results from a multi-channel partial wave analysis of elastic and inelastic $\pi N$ and $\gamma N$ induced reactions are presented. The analysis evidences the existence of a spin-quartet of nucleon resonances with total angular momenta $J^P=1/2^+,..., 7/2^+$. All states fall into a $\pm130$\,MeV mass gap centered at 1.97\,GeV. The spin quartet is at variance with S-wave diquark configurations required in classical di-quark models.

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