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Dong, Xiang-Kun; Guo, Feng-Kun; Zou, Bing-Song
Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum
Source PublicationPHYSICAL REVIEW LETTERS
Language英语
KeywordRESONANCES PENTAQUARK
AbstractTremendous 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.
2021
ISSN0031-9007
Volume126Issue:15Pages:152001
Cooperation Status国内
Subject AreaPhysics
MOST Discipline CataloguePhysics, Multidisciplinary
DOI10.1103/PhysRevLett.126.152001
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27321
CollectionSCI期刊论文
Affiliation1.[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
Recommended Citation
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.
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