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.

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Cited by in corpus (31)

• Pentaquark and Tetraquark states
• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• eta-photoproduction in the resonance energy region
• Quasi-free photoproduction of eta-mesons of the neutron
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• Light Baryon Spectroscopy
• Photoproduction of $\eta$ mesons off neutrons from a deuteron target
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI
• Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron
• Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV
• Insight into the narrow structure in {\boldmath{$\eta$}}-photoproduction on the neutron from helicity dependent cross sections
• The BGOOD experimental setup at ELSA
• New Narrow Nucleon N*(1685)
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Coupled $K^{+}\Lambda$ and $K^0\Lambda$ photoproduction off the nucleon: Consequences from the recent CLAS and MAMI data and the $N(1680)P_{11}$ narrow state
• Present status on experimental search for pentaquarks
• Axial-vector transitions and strong decays of the baryon antidecuplet in the self-consistent SU(3) chiral quark-soliton model
• Evidence for narrow resonant structures at $W\approx 1.68$ and $W\approx 1.72$ GeV in real Compton scattering off the proton
• eta photoproduction and N* resonances
• Vector transition form factors of the $N{K}^{\ast }\to {\Theta }^{+}$ and $N{\bar{K}}^{\ast }\to {\Sigma }_{\overline{10}}^{\ast -}$ in the SU(3) chiral quark-soliton model
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Energy dependent analysis of eta-meson photoproduction on protons and neutrons without background in the energy region up to 3.4 GeV
• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• Investigation of the anomaly in eta-photoproduction off the neutron
• A new candidate for non-strangeness pentaquarks: N*(1675)
• Search for the $N$(1685) in $\eta \pi$-Photoproduction
• Magnetic and axial-vector transitions of the baryon antidecuplet
• The neutron anomaly in the gamma N --> eta N cross section through the looking glass of the flavour SU(3) symmetry