A study of the Roper resonance as a hybrid state from J/psi decays
文献类型：期刊论文
| 作者 | Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.; Ping, RG; Chiang, HC; Zou, BS
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| 刊名 | NUCLEAR PHYSICS A
 |
| 出版日期 | 2004 |
| 卷号 | 743期号:40911页码:149-169 |
| 关键词 | Qcd Sum-rules Quark-model Gluon Mass Baryon Electroproduction Mesons Gev/c |
| ISSN号 | 0375-9474 |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000224229300006 |
| 公开日期 | 2012-08-30 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/13981]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.,Ping, RG,Chiang, HC,et al. A study of the Roper resonance as a hybrid state from J/psi decays[J]. NUCLEAR PHYSICS A,2004,743(40911):149-169. |
| APA | Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.,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(40911),149-169. |
| MLA | Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.,et al."A study of the Roper resonance as a hybrid state from J/psi decays".NUCLEAR PHYSICS A 743.40911(2004):149-169. |
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来源：理论物理研究所
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