Investigation of the anomaly in η-photoproduction off the neutron

  • Quasi-free photoproduction of η-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 η-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≈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.

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D. Werthmüller (for the Crystal Ball/TAPS collaborations). Investigation of the anomaly in η-photoproduction off the neutron[J]. Chinese Physics C, 2009, 33(12): 1345-1348. doi: 10.1088/1674-1137/33/12/051
D. Werthmüller (for the Crystal Ball/TAPS collaborations). Investigation of the anomaly in η-photoproduction off the neutron[J]. Chinese Physics C, 2009, 33(12): 1345-1348.  doi: 10.1088/1674-1137/33/12/051 shu
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Received: 2009-08-07
Revised: 1900-01-01
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Investigation of the anomaly in η-photoproduction off the neutron

  • (Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland)

Abstract: 

Quasi-free photoproduction of η-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 η-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≈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.

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