Recent pion electro-production experiments of the A1 Collaboration at MAMI arepresented. The threshold data in the p(e,e face="symbol">p) face="symbol">p0 and d(e,e face="symbol">d) face="symbol">p0 channels reveal the chiral dynamics of the pion-nucleonsystem at low energies. Measurements of the neutral channel in the face="symbol">Dregion address the issue of the pion cloud, while the p(e,e face="symbol">p+)nchannel gives access to the axial structure of the nucleon.
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机译：展示了最近在MAMI开展的A1协作的电介子电生产实验。 p（e，e face =“ symbol”> p） face =“ symbol”> p 0 和d（e， e face =“ symbol”> d） face =“ symbol”> p 0 通道揭示了低能量下介子核系统的手性动力学。在 face =“ symbol”> D 地区中立通道的测量解决了介子云的问题，而p（e，e face =“ symbol”> p < sup> + ）nchannel可访问核子的轴向结构。
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