A new mechanism for the electromagnetic transition γ^＊N→N^＊（1535）  

作　　者：安春生 邹冰松 

机构地区：[1]Institute of High Energy Physics,CAS [2]Graduate University of Chinese Academy of Sciences [3]Theoretical Physics Center for Science Facilities,CAS

出　　处：《Chinese Physics C》2010年第2期245-248,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10435080,10521003);Chinese Academy of Sciences (KJCX3-SYW-N2)

摘　　要：The heiicity amplitude A1/2^P for the electromagnetic transition γ^＊N→N^＊（1535） is investigated. It is found that a new mechanism γ^＊→q^-q plays an important role in order to improve the description of this transition. On one hand, the A1/2^p is decreased to fall in the data range at the photon point Q^2 = 0, while on the other hand, the new mechanism makes the function A1/2^p（Q^2） to decrease more slowly vs increasing Q^2 as required by the data.The heiicity amplitude A1/2^P for the electromagnetic transition γ^＊N→N^＊（1535） is investigated. It is found that a new mechanism γ^＊→q^-q plays an important role in order to improve the description of this transition. On one hand, the A1/2^p is decreased to fall in the data range at the photon point Q^2 = 0, while on the other hand, the new mechanism makes the function A1/2^p（Q^2） to decrease more slowly vs increasing Q^2 as required by the data.

关 键 词：N^＊（1535） electromagnetic transition helicity amplitudes 

分 类 号：O441[理学—电磁学]