Investigation of the anomaly in eta-photoproduction off the neutron

Abstract

Quasi-free photoproduction of eta-mesons off the neutron and off the proton has been studied using a deuterium target and bremsstrahlung photons produced by MAMI-C with incident energies up to 1.5 GeV. The eta-mesons were detected in coincidence with the recoil nucleons thus a fully exclusive measurement was performed. Preliminary results show a bump-like structure in the excitation function for the neutron close to W $\approx$ 1675 MeV which is not seen for the proton. Considering the experimental resolution and using a Breit-Wigner fit the width of this structure was approximated below 50 MeV.

oral contribution to the workshop on physics of the excited nucleon - NSTAR 2009, Beijing, April 2009

References in corpus (4)

• Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• Quasi-free photoproduction of eta-mesons of the neutron

Cited by in corpus (1)

• Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron