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题名: A study of the Roper resonance as a hybrid state from J/psi decays
作者: Ping, RG ;  Chiang, HC ;  Zou, BS
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
学科分类: Physics
通讯作者: Ping, RG , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
部门归属: CCAST, World Lab, Beijing 100080, Peoples R China; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Ctr Theoret Nucl Phys, Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000224229300006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13981
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Ping, RG,Chiang, HC,Zou, BS. A study of the Roper resonance as a hybrid state from J/psi decays[J]. NUCLEAR PHYSICS A,2004,743(40911):149-169.
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