In-medium Effects in the Eta-Photoproduction through the $S_{11}$ Resonance with the Relativistic Approach

Abstract

In-medium effects in photon excitation of the S${}_{11}$ resonance from nucleon and its decay to $\eta$-meson using the RMF approach is studied. We examine the in-medium effects by varing the Dirac fields of the nucleon and the S${}_{11}$ resonance separately. We obtained a conclusion that the Dirac fields of the nucleon, which reduces the nucleon effective mass, enlarge the width of S${}_{11}$ resonance, and small Dirac-fields of the resonance shifts the peak position, and these combined effects can explain the in-medium properties observed in the experimental data for ${}^{12}$C($\gamma$,$\eta$) reaction.

arXiv comment10 pages and 3 figures

Cited by in corpus (5)

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• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• Examination of $N^{\ast }(1535)$ as a probe to observe the partial restoration of chiral symmetry in nuclear matter
• Photoproduction of $\eta$-mesons off C and Cu nuclei for photon energies below 1.1 GeV
• Inclusive Photoproduction of $\eta$ Mesons on Nuclei and the in-medium properties of the S${}_{11}$ Resonance