TL;DR
The paper presents evidence supporting a new narrow nucleon resonance N*(1685), which exhibits strong neutron photo-coupling and may be part of an exotic baryon anti-decouplet, expanding understanding of baryon states.
Contribution
It introduces the existence of a narrow N*(1685) resonance with unique properties, suggesting its role as a non-strange partner of the pentaquark Theta+ and summarizing current knowledge.
Findings
Strong evidence for N*(1685) from eta photoproduction data
N*(1685) has a narrow width less than 25 MeV
Resonance couples more strongly to neutrons than protons
Abstract
We argue that the existence of a new narrow (Gamma < 25 MeV) nucleon resonance N*(1685) is strongly supported by recent data on eta photoproduction off the nucleon. The resonance has much stronger photo-coupling to the neutron than to the proton. This nucleon resonance is a good candidate for the non-strange member of the exotic anti-decouplet of baryons -- the partner of the pentaquark Theta+. All up to date known properties of new N*(1685) are summarized.
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