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arXiv 1109.6745nucl-thhep-ph
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核子共振的电磁激发

Electromagnetic Excitation of Nucleon Resonances

L. Tiator, D. Drechsel, S. S. Kamalov, M. Vanderhaeghen

摘要:

综述了近年来利用π介子光生和电生提取核子共振激发电磁特性的研究进展。对在MAMI、ELSA和CEBAF测量的截面数据进行分析,并与其他组的分析进行比较。在此基础上,我们导出了大多数四星核子共振态的纵、横跃迁形状因子。此外,我们讨论了如何过渡形状因子可以用来获得经验的横向电荷密度。由此导出的密度的等值线图显示为Delta,Roper,S11和D13核子共振。

英文摘要:

Recent progress on the extraction of electromagnetic properties of nucleon resonance excitation through pion photo- and electroproduction is reviewed. Cross section data measured at MAMI, ELSA, and CEBAF are analyzed and compared to the analysis of other groups. On this basis, we derive longitudinal and transverse transition form factors for most of the four-star nucleon resonances. Furthermore, we discuss how the transition form factors can be used to obtain empirical transverse charge densities. Contour plots of the thus derived densities are shown for the Delta, Roper, S11, and D13 nucleon resonances.

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