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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
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