Quasi-free photoproduction of eta-mesons of the neutron

Abstract

Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta-production off the neutron shows a pronounced bump-like structure at W=1.68 GeV (E_g ~ 1 GeV), which is absent for the proton.

accepted for publication in Phys. Rev. Lett

References in corpus (6)

• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Excited hadrons on the lattice: Baryons
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• eta-photoproduction in the resonance energy region
• Photoproduction of pi0-mesons from nuclei
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance

Cited by in corpus (22)

• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• Light Baryon Spectroscopy
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• 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
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0{\pi }^{\pm }$-pairs off protons and off neutrons
• 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
• Evidence for narrow resonant structures at $W\approx 1.68$ and $W\approx 1.72$ GeV in real Compton scattering off the proton
• Analysis of recent eta photoproduction data
• 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
• Search for the $N$(1685) in $\eta \pi$-Photoproduction