电磁介子产生中新核子共振的证据
Evidence of new nucleon resonances from electromagnetic meson production
摘要：
讨论了用CLAS探测器研究电磁介子产生中的核子共振。电磁相互作用在核子激发谱的研究中与π介子散射是互补的。更高质量的状态通常从$Nπ$通道去耦，并且在$πN \to πN$中看不到。光生介子，如$KΛ$，$ωp$和$η^\prime p$可能对这些状态中的许多更敏感。CLAS探测器，结合使用能量标记的极化光子和极化电子，以及极化目标和反冲极化的测量，是一个全面的核子共振计划所需的工具。最近发表的一些高统计数据集对进一步澄清核子激发谱有重要影响。
英文摘要：
The study of nucleon resonances in electromagnetic meson production with the CLAS detector is discussed. The electromagnetic interaction is complementary to pion scattering in the exploration of the nucleon excitation spectrum. Higher mass states often decouple from the $Nπ$ channel and are not seen in $πN \to πN$. Photoproduction of mesons, such as $KΛ$, $ωp$ and $η^\prime p$ may be more sensitive to many of these states. The CLAS detector, combined with the use of energy-tagged polarized photons and polarized electrons, as well as polarized targets and the measurement of recoil polarization, are the tools needed for a comprehensive nucleon resonance program. Some of the recently published high statistics data sets had significant impact on further clarifying the nucleon excitation spectrum.
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