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A study of the Roper resonance as a hybrid state from J/psi decays
Ping RG(平荣刚); Jiang HQ(姜焕清); Zou BS(邹冰松); Ping, RG; Chiang, HC; Zou, BS
2004
发表期刊NUCLEAR PHYSICS A
卷号743期号:1-3页码:#REF!
通讯作者Ping, RG (reprint author), CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
文章类型Article
摘要The structure of the Roper resonance as a hybrid baryon is investigated through studying the transitional amplitudes in J/psi --> (p) over barN*, (N) over bar *N* decays. We begin with perturbative QCD to describe the dynamical process for the J/psi --> 3 (q) over bar + 3q decay to the lowest order of alpha(s), and by extending the modified quark creation model to the J/psi energy region to describe the J/psi --> 3 (q) over bar + 3q + g process. The nonperturbative effects are incorporated by a simple quark model of baryons to evaluate the angular distribution parameters and decay widths for the processes J/psi --> (p) over barN*, (N) over bar *N*. From fitting the decay width of J/psi --> gammap (p) over bar to the experimental data, we extract the quark-pair creation strength g(I) = 15.40 GeV. Our numerical results for J/psi --> (p) over barN*, (N) over bar *N* decays show that the branching ratios for these decays are quite different if the Roper resonance is assumed to be a common 3q state or a pure hybrid state. For testing its mixing properties, we present a scheme to construct the Roper wave function by mixing \qqqg> state with a normal \qqq,2s> state. Under this picture, the ratios of the decay widths to that of the J/psi --> p (p) over bar decay are re-evaluated versus the mixing parameter. A test of the hybrid nature of the Roper resonance in J/psi decays is discussed. (C) 2004 Elsevier B.V. All rights reserved.
关键词Roper resonance structure hybrid state J/psi
学科领域Physics
DOI10.1016/j.nuclphysa.2004.07.004
收录类别SCI
WOS类目Physics, Nuclear
WOS记录号WOS:000224229300006
引用统计
被引频次:4[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/311005/226509
专题理论物理室
实验物理中心
推荐引用方式
GB/T 7714
Ping RG,Jiang HQ,Zou BS,et al. A study of the Roper resonance as a hybrid state from J/psi decays[J]. NUCLEAR PHYSICS A,2004,743(1-3):#REF!.
APA 平荣刚,姜焕清,邹冰松,Ping, RG,Chiang, HC,&Zou, BS.(2004).A study of the Roper resonance as a hybrid state from J/psi decays.NUCLEAR PHYSICS A,743(1-3),#REF!.
MLA 平荣刚,et al."A study of the Roper resonance as a hybrid state from J/psi decays".NUCLEAR PHYSICS A 743.1-3(2004):#REF!.
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