Coherent η-photoproduction on 4He and 12C in the near-threshold region
A. Fix, H. Arenhoevel
Abstract
Coherent η meson photoproduction on 4He and 12C is considered in the near-threshold region. The elementary η photoproduction operator includes contributions from the S11(1535) and D13(1520) resonances as well as t-channel vector meson exchange and the nucleon pole terms. Due to the suppression of the dominant S11(1535) resonance for spin and isospin saturated nuclei, the reaction is mainly governed by ω exchange. Furthermore, the influence of Fermi motion and of different prescriptions for the choice of the invariant reaction energy WγN in the elementary amplitude is studied.
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