Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum

doi:10.1103/PhysRevLett.126.152001

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	Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum
	Dong, Xiang-Kun ; Guo, Feng-Kun ; Zou, Bing-Song
刊名	PHYSICAL REVIEW LETTERS
	2021
卷号	126 期号:15 页码:152001
关键词	RESONANCES PENTAQUARK
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.126.152001
英文摘要	Tremendous progress has been made experimentally in the hadron spectrum containing heavy quarks in the last two decades. It is surprising that many resonant structures arc around thresholds of a pair of heavy hadrons. There should be a threshold cusp at any S-wave threshold. By constructing a nonrelativistic effective field theory with open channels, we discuss the generalities of threshold behavior, and offer an explanation of the abundance of near-threshold peaks in the heavy quarkonium regime. We show that the threshold cusp can show up as a peak only for channels with attractive interaction, and the width of the cusp is inversely proportional to the reduced mass relevant for the threshold. We argue that there should be threshold structures at any threshold of a pair of heavy-quark and heavy-antiquark hadrons, which have attractive interaction at threshold, in the invariant mass distribution of a heavy quarkonium and light hadrons that couple to that open-flavor hadron pair. The structure becomes more pronounced if there is a near-threshold pole. Predictions of the possible pairs are also given for the ground state heavy hadrons. Precisely measuring the threshold structures will play an important role in revealing the heavy-hadron interactions, and thus understanding the puzzling hidden-charm and hidden-bottom structures.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27321]
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.[Dong, Xiang-Kun 2.Guo, Feng-Kun 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 5.Cent South Univ, Sch Phys, Changsha 410083, Peoples R China
推荐引用方式 GB/T 7714	Dong, Xiang-Kun,Guo, Feng-Kun,Zou, Bing-Song. Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum[J]. PHYSICAL REVIEW LETTERS,2021,126(15):152001.
APA	Dong, Xiang-Kun,Guo, Feng-Kun,&Zou, Bing-Song.(2021).Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum.PHYSICAL REVIEW LETTERS,126(15),152001.
MLA	Dong, Xiang-Kun,et al."Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum".PHYSICAL REVIEW LETTERS 126.15(2021):152001.