We present a relativistic and unitary approach to pion- and photon-nucleon scattering taking into account the $\pi N$, $\rho N$, $\omega N$, $\eta N$, $\pi\Delta$, $K \Lambda$ and $K \Sigma$ channels. Our scheme dynamically generates the s- and d-wave nucleon resonances N(1535), N(1650), N(1520) and N(1700) and isobar resonances $\Delta(1620)$ and $\Delta(1700)$ in terms of quasi-local two-body interaction terms. We obtain a fair description of the experimental data relevant for slow vector-meson propagation in nuclear matter. The s-wave $\rho $- and $\omega $-meson nucleon scattering amplitudes, which define the leading density modification of the $\rho$- and $\omega $-meson spectral functions in nuclear matter, are predicted.
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机译：考虑到$ \ pi N $，$ \ rho N $，$ \ omega N $，$ \ eta N $，$ \ pi \ Delta $，我们提出了相对论和统一的介子和光子核子散射方法。 $ K \ Lambda $和$ K \ Sigma $通道。我们的方案动态生成s和d波核子共振N（1535），N（1650），N（1520）和N（1700）以及等压线共振$ \ Delta（1620）$和$ \ Delta（1700）$就准局部两体相互作用而言。我们获得了与核物质中慢速介子传播有关的实验数据的公平描述。预测了s波$ rho和$ω介子的核子散射幅度，它们定义了核物质中$ rho和$ω介子谱函数的主导密度修正。
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