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

A. V. Anisovich; A. V. Sarantsev; E. Klempt; U. Thoma; V. A. Nikonov

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

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arxiv 1111.6150 v2 pith:TOETZ7TP submitted 2011-11-26 hep-ex

A. V. Anisovich , E. Klempt , V. A. Nikonov , A. V. Sarantsev , U. Thoma This is my paper

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keywords analysisnucleonresonancesspin-quartetangularcenteredclassicalconfigurations

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abstract

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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