Nature of the Y(4260): A light-quark perspective

doi:10.1103/PhysRevD.99.074016

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	Nature of the Y(4260): A light-quark perspective
	Chen, YH ; Dai, LY ; Guo, FK ; Kubis, B 1,6
刊名	PHYSICAL REVIEW D
	2019
卷号	99 期号:7 页码:74016
关键词	FINAL-STATE INTERACTIONS DECAY AMPLITUDE EQUATIONS
ISSN号	2470-0010
DOI	10.1103/PhysRevD.99.074016
英文摘要	The Y(4260) has been one of the most puzzling pieces among the so-called XYZ states. In this paper, we try to gain insights into the structure of the Y(4260) from the light-quark perspective. We study the dipion invariant mass spectrum of the e(+) e(-) -> Y(4260) -> J/psi pi(+)pi(-) process and the ratio of the cross sections sigma(e(+)e(-) -> J/psi K+ K-)/sigma(e(+)e(-) -> J/psi pi(+)pi(-)). In particular, we consider the effects of different light-quark SU(3) eigenstates inside the Y(4260). The strong pion-pion final-state interactions as well as the K (K) over bar coupled channel in the S-wave are taken into account in a model-independent way using dispersion theory. We find that the SU(3) octet state plays a significant role in these transitions, implying that the Y(4260) contains a large light-quark component. Our findings suggest that the Y(4260) is neither a hybrid nor a conventional charmonium state, and they are consistent with the Y(4260) having a sizeable (D) over barD(1) component which, however, is not completely dominant.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23450]
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.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 2.Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany 3.Univ Sci & Technol Beijing, Sch Math & Phys, Beijing 100083, Peoples R China 4.Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China 5.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 6.Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany
推荐引用方式 GB/T 7714	Chen, YH,Dai, LY,Guo, FK,et al. Nature of the Y(4260): A light-quark perspective[J]. PHYSICAL REVIEW D,2019,99(7):74016.
APA	Chen, YH,Dai, LY,Guo, FK,&Kubis, B.(2019).Nature of the Y(4260): A light-quark perspective.PHYSICAL REVIEW D,99(7),74016.
MLA	Chen, YH,et al."Nature of the Y(4260): A light-quark perspective".PHYSICAL REVIEW D 99.7(2019):74016.