Resonance on top of thresholds: The Lambda(c) (2595)(+) as an extremely fine-tuned state

doi:http://dx.doi.org/10.1103/PhysRevD.93.054014

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	Resonance on top of thresholds: The Lambda(c) (2595)(+) as an extremely fine-tuned state
	Guo, ZH ; Oller, JA
刊名	PHYSICAL REVIEW D
	2016
卷号	93 期号:5 页码:54014
关键词	EFFECTIVE-FIELD THEORY NUCLEAR-FORCES SCATTERING EQUATION CHIRAL DYNAMICS BARYON STATES CHARM PARTICLES
DOI	http://dx.doi.org/10.1103/PhysRevD.93.054014
英文摘要	A dedicated study of the pi Sigma(c) scattering around its threshold is carried out in this work to probe the nature of Lambda(c)(2595)(+). We first demonstrate that the effective range expansion approach fails to work near the Lambda(c)(2595)(+) pole position, due to the presence of a nearby Castillejo-Dalitz-Dyson (CDD) pole around the pi Sigma(c) thresholds. We then develop a general framework to properly handle the situation with a CDD pole accompanied by nearby thresholds, which is first elaborated for the single-channel case and then generalized to the coupled-channel study. The isospin-breaking effects of the three pi Sigma(c) channels with different thresholds are specially taken into account in our study. The finite-width effects from the Sigma(c) baryons are considered and found to be relevant to give the Lambda(c)(2595)(+) width fully compatible with its experimental value. Through the compositeness analysis, our robust conclusion is that the pi(0)Sigma(+)(c) component is subdominant inside the Lambda(c)(2595)(+).
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
资助机构	MINECO (Spain) ; ERDF (European Commission) [FPA2013-40483-P] ; Spanish Excellence Network on Hadronic Physics [FIS2014-057026-0REDT] ; National Natural Science Foundation of China (NSFC) [11575052, 11105038] ; Natural Science Foundation of Hebei Province [A2015205205] ; Education Department of Hebei Province [YQ2014034] ; Department of Human Resources and Social Security of Hebei Province [C201400323]
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23304]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.[Oller, J. A.] Univ Murcia, Dept Fis, E-30071 Murcia, Spain 2.Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China 3.Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Guo, ZH,Oller, JA. Resonance on top of thresholds: The Lambda(c) (2595)(+) as an extremely fine-tuned state[J]. PHYSICAL REVIEW D,2016,93(5):54014.
APA	Guo, ZH,&Oller, JA.(2016).Resonance on top of thresholds: The Lambda(c) (2595)(+) as an extremely fine-tuned state.PHYSICAL REVIEW D,93(5),54014.
MLA	Guo, ZH,et al."Resonance on top of thresholds: The Lambda(c) (2595)(+) as an extremely fine-tuned state".PHYSICAL REVIEW D 93.5(2016):54014.