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

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

2002-04-19

arxiv.org/abs/nucl-th/0204051v2

Prog.Theor.Phys. 111 (2004) 229-243

Physics

Nuclear Physics

Nuclear Theory

10 pages and 3 figures

Scientific paper

10.1143/PTP.111.229

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.

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