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The role of the qqqq(q)over-bar components in the electromagnetic transition gamma*N -> N* (1535)
An CS(安春生); Zou BS(邹冰松); An, CS; Zou, BS
2009
发表期刊EUROPEAN PHYSICAL JOURNAL A
卷号39期号:2页码:#REF!
通讯作者An, CS (reprint author), Inst High Energy Phys, CAS, POB 918 4, Beijing 100049, Peoples R China.
文章类型Article
摘要The helicity amplitudes A(1/2)(p) and S(1/2)(p) for the electromagnetic transition gamma*N -> N* (1535) are calculated in the quark model that is extended to include the lowest-lying qqqq (q) over bar components in addition to the qqq component. It is found that with admixture of 5-quark components with a proportion of 20% in the nucleon and 25-65% in the N* (1535)-resonance the calculated helicity amplitude A(1/2)(p) decreases at the photon point, Q(2) = 0 to the empirical range. The qqqq (q) over bar components contain s (s) over bar pairs, which is consistent with the substantial width for N eta decay of the N* (1535). The best description of the momentum dependence of the empirical helicity amplitudes is obtained by assuming that the qqqq (q) over bar components are more compact than the qqq component. However, this version of the extended quark model still does not lead to a satisfactory simultaneous description of both A(1/2)(p) and S(1/2)(p) although with significant improvement.
学科领域Physics
DOI10.1140/epja/i2008-10698-x
收录类别SCI
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000263508200008
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被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226854
专题理论物理室
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GB/T 7714
An CS,Zou BS,An, CS,et al. The role of the qqqq(q)over-bar components in the electromagnetic transition gamma*N -> N* (1535)[J]. EUROPEAN PHYSICAL JOURNAL A,2009,39(2):#REF!.
APA 安春生,邹冰松,An, CS,&Zou, BS.(2009).The role of the qqqq(q)over-bar components in the electromagnetic transition gamma*N -> N* (1535).EUROPEAN PHYSICAL JOURNAL A,39(2),#REF!.
MLA 安春生,et al."The role of the qqqq(q)over-bar components in the electromagnetic transition gamma*N -> N* (1535)".EUROPEAN PHYSICAL JOURNAL A 39.2(2009):#REF!.
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