New Narrow $N(1685)$ and $N(1726)$? Remarks on the Interpretation of the Neutron Anomaly as an Interference Phenomenon

Abstract

Different interpretations of narrow structures at $W\sim 1.68$ and $W\sim 1.72$ GeV observed in several reactions are discussed. It is questionable whether interference phenomena could explain the whole complex of experimental findings. More probable hypotheses would be the existence of one or two narrow resonances $N(1685)$ and $N(1726)$ and/or the sub-threshold virtual $K\Sigma$ and $\omega p$ production (cusps).

Published version

References in corpus (18)

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• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• eta-photoproduction in the resonance energy region
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• Comment on "Evidence for narrow resonant structures at $W\approx$ 1.68 GeV and $W\approx$ 1.72 GeV in real Compton scattering off the proton"
• Search for narrow resonances in $\pi p$ elastic scattering from the EPECUR experiment

Cited by in corpus (4)

• $K^0\Lambda$ photoproduction off the neutron with nucleon resonances
• Observation of Narrow $N^{+}(1685)$ and $N^0(1685)$ Resonances in $\gamma N\to \eta \pi N$ Reactions
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Differential technique for the covariant orbital angular momentum operators