核子共振态的螺旋度振幅的计算

The Calculation for the Helicity Amplitudes of the Nucleon Resonances and the Meson Cloud Effect in Relativistic Quark Model

相对论夸克模型用来计算面和Ｎ＊的电产生振幅．介子云的贡献是一个重要的课题．计算表明考虑了介子云的作用对面和Ｎ＊（１４４０）螺旋度振幅的解释将会有明显的改进．这有助于进一步认识Ｒｏｐｅｒ共振态的性质．

Relativistic quark model is employed to study the helicity amplitudes and the electroproduction amplitudes of the a(1232) and N* (1440). The meson cloud effect is considered. The calculations show the improved results for those spin observebles. A good description for the Roper resonance is achived.