Observation of Narrow $N^{+}(1685)$ and $N^0(1685)$ Resonances in $\gamma N\to \eta \pi N$ Reactions

Abstract

Observation of a narrow structure at $W\sim 1.68$ GeV in the excitation functions of some photon- and pion-induced reactions may signal a new narrow isospin-1/2 $N(1685)$ resonance. New data on the $\gamma N\to \pi \eta N$ reactions from GRAAL seems to reveal the signals of both $N^{+}(1685)$ and $N^0(1685)$ resonances.

arXiv commentPublished version

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Cited by in corpus (8)

• Spectroscopy of light $N^{\ast }$ baryons
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Observation of a structure in the M${}_{p\eta }$ invariant mass distribution near 1700 MeV/$c^2$ in the $\gamma \mathbf{p}\to \mathbf{p}{\pi }^0\eta$ reaction
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Search for the $N$(1685) in $\eta \pi$-Photoproduction
• New narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the chiral quark-soliton model
• Complete basis for the pentaquark wave function in a group theory approach