Coupled-Channel Interpretation of the LHCb Double-J/psi Spectrum and Hints of a New State Near the J/psi J/psi Threshold

doi:10.1103/PhysRevLett.126.132001

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	Coupled-Channel Interpretation of the LHCb Double-J/psi Spectrum and Hints of a New State Near the J/psi J/psi Threshold
	Dong, Xiang-Kun ; Baru, Vadim 2,3,4,5; Guo, Feng-Kun ; Hanhart, Christoph 6,7; Nefediev, Alexey 5,8
刊名	PHYSICAL REVIEW LETTERS
	2021
卷号	126 期号:13 页码:132001
关键词	HEAVY TETRAQUARKS RESONANCES
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.126.132001
英文摘要	Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of J/psi pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a coupled-channel approach employing T matrices consistent with unitarity: (i) with just two channels, J/psi J/psi and psi/(2S)J/psi, as long as energy-dependent interactions in these channels are allowed, or (ii) with three channels J/psi J/psi, psi/(2S)J/psi and psi(3770)J/psi with just constant contact interactions. Both formulations hint at the existence of a nearthreshold state in the J/psi J/psi system with the quantum numbers J(PC) = 0(++) or 2(++), which we refer to as X(6200). We suggest experimental tests to check the existence of this state and discuss what additional channels need to be studied experimentally to allow for distinctive tests between the two mechanisms proposed. If the molecular nature of X(6200), as hinted by the three-channel approach, is confirmed, many other double-quarkonium states should exist driven by the same binding mechanism. In particular, there should be an eta(c)eta(c) molecule with a similar binding energy.
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/311006/27301]
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.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Zhong Guan Cun East St 55, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 3.Univ Bonn, Hebnholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany 4.Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany 5.Kurchatov Inst, Inst Theoret & Expt Phys NRC, Moscow 117218, Russia 6.Russian Acad Sci, PN Lebedev Phys Inst, Leninskiy Prospect 53, Moscow 119991, Russia 7.Forschungszentrum Julich, Inst Adv Simulat, Inst Kernphys, D-52425 Julich, Germany 8.Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany 9.Moscow Inst Phys & Technol, Inst Sky Lane 9, Dolgoprudnyi 141700, Moscow Region, Russia
推荐引用方式 GB/T 7714	Dong, Xiang-Kun,Baru, Vadim,Guo, Feng-Kun,et al. Coupled-Channel Interpretation of the LHCb Double-J/psi Spectrum and Hints of a New State Near the J/psi J/psi Threshold[J]. PHYSICAL REVIEW LETTERS,2021,126(13):132001.
APA	Dong, Xiang-Kun,Baru, Vadim,Guo, Feng-Kun,Hanhart, Christoph,&Nefediev, Alexey.(2021).Coupled-Channel Interpretation of the LHCb Double-J/psi Spectrum and Hints of a New State Near the J/psi J/psi Threshold.PHYSICAL REVIEW LETTERS,126(13),132001.
MLA	Dong, Xiang-Kun,et al."Coupled-Channel Interpretation of the LHCb Double-J/psi Spectrum and Hints of a New State Near the J/psi J/psi Threshold".PHYSICAL REVIEW LETTERS 126.13(2021):132001.