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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
Source PublicationEUROPEAN PHYSICAL JOURNAL A
Volume39Issue:2Pages:#REF!
Corresponding AuthorAn, CS (reprint author), Inst High Energy Phys, CAS, POB 918 4, Beijing 100049, Peoples R China.
SubtypeArticle
AbstractThe 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.
Subject AreaPhysics
DOI10.1140/epja/i2008-10698-x
Indexed BySCI ; INSPIREHEP ; ADS
WOS SubjectPhysics, Nuclear ; Physics, Particles & Fields
WOS IDWOS:000263508200008
ADS Bibcode2009EPJA...39..195A
ADS URLhttps://ui.adsabs.harvard.edu/abs/2009EPJA...39..195A
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2009EPJA...39..195A/citations
inspireid780125
inspireURLhttps://inspirehep.net/literature/780125
Citation statistics
Cited Times:49 [INSPIRE]
Cited Times:50 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/226854
Collection理论物理室
Recommended Citation
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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