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题名: Lambda(c)(2595) resonance as a dynamically generated state: The compositeness condition and the large N-c evolution
作者: Lu, JX ;  Chen, HX ;  Guo, ZH ;  Nieves, J ;  Xie, JJ ;  Geng, LS
刊名: PHYSICAL REVIEW D
出版日期: 2016
卷号: 93, 期号:11, 页码:114028
学科分类: Astronomy & Astrophysics; Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.93.114028
通讯作者: Geng, LS (reprint author), Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China. ;  Geng, LS (reprint author), Beihang Univ, Int Res Ctr Nuclei & Particles Cosmos, Beijing 100191, Peoples R China. ;  Geng, LS (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: Recent studies have shown that the well-established Lambda(c) (2595) resonance contains a large meson-baryon component, which can vary depending on the specific formalism. In this work, we examine such a picture by utilizing the compositeness condition and the large number of colors (N-c) expansion. We examine three different models fulfilling two body unitarily in coupled-channels, and adopting renormalization schemes where the mass of the Lambda(c)(2595) resonance is well described, but not necessarily its width, since we do not consider three body channels and work at the isospin symmetric limit. Both approximations might have an effect larger on the width than on the mass. In this context, our studies show that the compositeness of the Lambda(c)(2595) depends on the number of considered coupled channels, and on the particular regularization scheme adopted in the unitary approaches and, therefore, is model dependent. In addition, we perform an exploratory study of the Lambda(c)(2595) in the large N-c expansion, within a scheme involving only the pi Sigma(c) and K Xi(c)', channels, whose dynamics is mostly fixed by chiral symmetry. In this context and formulating the leading-order interaction as a function of N-c, we show that for moderate N-c > 3 values, the mass and width of the Lambda(c)(2595) deviate from those of a genuine qqq baryon, implying the relevance of meson-baryon components in its wave function. Furthermore, we study the properties of the Lambda(c)(2595), in the strict N-c -> infinity limit, using an extension of the chiral Weinberg-Tomozawa interaction to an arbitrary number of flavors and colors. This latter study hints at the possible existence of a (perhaps) subdominant qqq component in the Lambda(c)(2595) resonance wave function, which would become dominant when the number of colors gets sufficiently large.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: CHIRAL PERTURBATION-THEORY ;  BETHE-SALPETER APPROACH ;  ELEMENTARY PARTICLE ;  BARYON RESONANCES ;  SKYRME MODEL ;  SYMMETRY ;  MESONS ;  CHARM ;  LIMIT ;  LAMBDA(1405)
收录类别: SCI
项目资助者: National Natural Science Foundation of China (NSFC) [11375024, 11522539, 11575052, 11105038] ;  Spanish Ministerio de Economia y Competitividad ;  European FEDER [FIS2014-51948-C2-1-P, FIS2014-57026-REDT, SEV-2014-0398] ;  Generalitat Valenciana [PROMETEOII/2014/0068] ;  Natural Science Foundation of Hebei Province [A2015205205] ;  Education Department of Hebei Province [YQ2014034] ;  Department of Human Resources and Social Security of Hebei Province [C201400323] ;  Sino-German Collaborative Research Center "Symmetries and the Emergence of Structure in QCD" - DFG [CRC 110] ;  NSFC
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21612
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Lu, JX,Chen, HX,Guo, ZH,et al. Lambda(c)(2595) resonance as a dynamically generated state: The compositeness condition and the large N-c evolution[J]. PHYSICAL REVIEW D,2016,93(11):114028.
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