Electroproduction of Roper Resonance in a Meson Cloud Model  

作　　者：CHEN Dian-Yong DONG Yu-Bing 

机构地区：[1]Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Communications in Theoretical Physics》2008年第7期142-148,共7页理论物理通讯（英文版）

基　　金：National Natural Science Foundation of China under Grant No.10475088;the CAS Knowledge Innovation Project under Grant No.KC2-SW-N02

摘　　要：The Q^2 dependencies of Roper resonance (N~* (1440)) helicity amplitudes have been discussed based on twoassumptions:(i) the Roper resonance is an excitation of one of the three quarks,and (ii) the quarks are surrounded bya pion-meson cloud.Our study shows that the mixing of the ground state in the Roper wavefunction caused by the pionmeson cloud together with the pion meson cloud itself is crucial for the predictions of the photoproduction amplitudesof the Roper resonance.It is found that our model can give a good description for the helicity amplitudes of the Roperresonance comparing with the experimental measurement.

关 键 词：photo-production amplitudes Roper resonance meson cloud 

分 类 号：O57[理学—粒子物理与原子核物理]