Electromagnetic Properties of S11 States in a Light Cone Quark Model  

作　　者：HE Jun DONG Yu-Bing 

机构地区：[1]Institute of High Energy Physics, the Chinese Academy of Sciences, P.O. Box 918-4, Beijing 100049, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Communications in Theoretical Physics》2006年第2X期269-274,共6页理论物理通讯（英文版）

基　　金：The project supported by National Natural Science Foundation of China under Grant Nos. 10075056 and 90103020 and the CAS Knowledge Innovation Project under Grant No. KC2-SW-N02.

摘　　要：Using relativistic spin-flavor wave functions of a Lorentz-covariant light cone quark model, we calculate the electromagnetic form factors of two S11 resonances, N（1535） and N（1650）, and the helicity amplitudes A1/2 and S1/2 for electroexcitation of the S11 resonances from the nucleon. The electromagnetic form factors of these S11 resonances are found to be similar to those of the nucleon in shape, while the charge form factor of neutral N（1650） is nearly zero. The relative peak height of the S11 charge form factors is controlled by the mixing angle common to both resonance wave functions. As in most quark models, there is a systematic overestimate of A1/2 in both N（1535） and N（1650） cases at the photon point. A sizeable S1/2 for all cases is produced as suggested by experiments.

关 键 词：electromagntic properties S11 states light cone quark model 

分 类 号：O441[理学—电磁学]