MKPH-T-97-4 Coherent η-photoproduction on 4 He and 12 C in the near-threshold region ∗
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Influence of final state interaction on incoherent η - photoproduction on the deuteron near threshold ∗
Incoherent η-photoproduction on the deuteron is studied for photon energies from threshold up to 720 MeV. The elementary γN → ηN amplitude is constructed in the frame of a conventional isobar model. Effects of final state interaction are investigated and their role in the cross section as well as in polarization observables is found to be important. Inclusion of such effects leads to a satisfac...
متن کاملThree - Body Analysis of Incoherent Photoproduction of η Mesons on the Deuteron near Threshold ∗
The importance of three-body dynamics in the ηnp system in elastic and inelastic η-deuteron scattering as well as coherent and incoherent η photo-production on the deuteron in the energy region from threshold up to 30 MeV above has been investigated. It is shown that a restriction to first order rescat-tering with respect to the N N-and ηN-final state interactions, i.e., restriction to rescatte...
متن کاملExclusive measurement of coherent η photoproduction from the deuteron
Coherent photoproduction of η mesons from the deuteron has been measured from threshold up to Eγ ≈ 750 MeV using the photon spectrometer TAPS at the tagged photon facility at the Mainz microtron MAMI. For the first time, differential coherent cross sections have been deduced from the coincident detection of the η meson and the recoil deuteron. A missing energy analysis was used for the suppress...
متن کامل- th / 9 90 60 19 v 1 8 J un 1 99 9 MKPH - T - 99 - 4 Medium Effects in Coherent Pion Photo - and Electroproduction on 4 He and 12
Coherent π0 photoand electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by the recently developed unitary isobar model. Medium effects are considered by introducing a phenomenological ∆ self-energy. The recent experimental data for 4He and 12C can be well described over a wide ...
متن کاملCoherent π 0 and η Photoproduction on the Deuteron
Coherent pion photoproduction, d(γ, π 0)d, is calculated in a coupled channels approach in momentum space using an elementary production operator that includes Born terms, vector meson exchange and M 1/E2 ∆-resonance exci-tation. The final state interaction is treated in the KMT multiple scattering approach that describes πd elastic scattering well. Differential cross sections are found to agre...
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تاریخ انتشار 2008