Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron

Abstract

New results on quasi-free $\eta$ photoproduction on the neutron and proton bound in a deuteron target are presented. The $\gamma n\to \eta n$ quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow ($M\sim 1.68$ GeV, $\Gamma \le 30$ MeV) baryon state.

arXiv commentReplaced with published version

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Cited by in corpus (71)

• Pentaquark and Tetraquark states
• Baryon spectroscopy
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• eta-photoproduction in the resonance energy region
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• On the cross section ratio sigma_n/sigma_p in eta photoproduction
• Quasi-free photoproduction of eta-mesons off the deuteron
• Light Baryon Spectroscopy
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• Photoproduction of $\eta$ mesons off neutrons from a deuteron target
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• Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI
• $\eta$ photoproduction on the quasi-free nucleons in the chiral quark model
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• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• $K^0\Lambda$ photoproduction off the neutron with nucleon resonances
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• Observation of Narrow $N^{+}(1685)$ and $N^0(1685)$ Resonances in $\gamma N\to \eta \pi N$ Reactions
• 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"
• EPECUR setup for the search of narrow baryon resonances in the pion-proton scattering
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Eta and kaon production in a chiral quark model
• On strange SU(3) partners of Theta+
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• Compton scattering off proton in the third resonance region
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