论文标题
$ 1.2 <e_γ<4.7 $ gev使用杰斐逊实验室的$ 1.2 <e_γ<4.7 $ gev的$η$ mesons的光生生源
Photoproduction of $η$ mesons off the proton for $1.2 < E_γ< 4.7$ GeV using CLAS at Jefferson Laboratory
论文作者
论文摘要
据报道，使用能量标记的光子和杰斐逊实验室的CLAS光谱仪，据报道了反应$γp\ topη$的光生效截面。 $η$介子在其主要充电模式下检测到$η\toπ^+π^-π^0 $，并且在差分横截面上的结果以1.2和4.7 GEV之间的入射光子能量显示。这些新的$η$光增生数据与早期的CLAS结果一致，但将能量范围扩展到核子谐振区域以外的范围。还将归一化的角度分布与其他几个实验的实验结果进行了比较，并预测了$η$ aid \，2018年的最新解决方案和BONN-GATCHINA耦合通道分析的最新解决方案。差异横截面$dσ/dt $用于入射光子能量$e_γ> 2.9 $ gev（$ w> 2.5 $ gev），并与基于$ t $ channel（regge型号）中的regge轨迹交换的预测相比。数据证实了联合物理分析中心的分析中的$ρ$，$ω$ vector-Meson Exchange的预期优势。
Photoproduction cross sections are reported for the reaction $γp\to pη$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $η$ mesons are detected in their dominant charged decay mode, $η\to π^+π^-π^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $η$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of $η$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $dσ/dt$ are presented for incident photon energies $E_γ> 2.9$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $t$-channel (Regge models). The data confirm the expected dominance of $ρ$, $ω$ vector-meson exchange in an analysis by the Joint Physics Analysis Center.
