论文标题
在动态耦合通道方法中的反应$πn\ toωn$
The reaction $πN \to ωN$ in a dynamical coupled-channel approach
论文作者
论文摘要
对轻型媒介中 - 巴里子散射的精致研究是使用动态耦合通道方法（Jülich-Bonn模型）进行的，该模型尊重Unitartiy和分析性约束。 $πn$，$πδ$，$σn$，$ρn$，$ηn$，$kλ$和$kσ$的通道空间可以通过添加$ωn$ final State进行扩展。 $ n^*$和$δ$共振的光谱是根据散射幅度的复杂极点提取的，这是基于全球拟合全球数据集合的结果，在能源区域的全球数据集合，从$πn$ threshold到$πn$ threshold到中心的质量$ z = 2.3 $ gev。提取了$ωn$弹性自旋平均散射长度的负值，质疑在核物质中$ω$中的绑定状态的存在。
A refined investigation on light flavor meson-baryon scatterings is performed using a dynamical coupled-channel approach, the Jülich-Bonn model, that respects unitartiy and analyticity constraints. The channel space of $πN$, $πΔ$, $σN$, $ρN$, $ηN$, $K Λ$ and $K Σ$ is extended by adding the $ωN$ final state. The spectra of $N^*$ and $Δ$ resonances are extracted in terms of complex poles of the scattering amplitudes, based on the result of a global fit to a worldwide collection of data, in the energy region from the $πN$ threshold to center-of-mass energy $z=2.3$ GeV. A negative value of the $ωN$ elastic spin-averaged scattering length is extracted, questioning the existence of bound states of the $ω$ meson in the nuclear matter.
