The role of the qqqq(q)over-bar components in the electromagnetic transition gamma*N -> N* (1535)
文献类型：期刊论文
| 作者 | An CS(安春生) ; Zou BS(邹冰松); An, CS; Zou, BS
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| 刊名 | EUROPEAN PHYSICAL JOURNAL A
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| 出版日期 | 2009 |
| 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. |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Nuclear ; Physics, Particles & Fields |
| 收录类别 | SCI |
| WOS记录号 | WOS:000263508200008 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/226854]  |
| 专题 | 高能物理研究所_理论物理室 |
| 推荐引用方式 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!. |
入库方式： OAI收割
来源：高能物理研究所
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