Electromagnetic Form Factors of Lambda Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e(+)e(-)->Lambda(Lambda)over-bar over bar Reaction

doi:10.1088/0256-307X/39/1/011201

	Electromagnetic Form Factors of Lambda Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e(+)e(-)->Lambda(Lambda)over-bar over bar Reaction
	Li, Zhong-Yi 1,2; Dai, An-Xin 1,2; Xie, Ju-Jun 1,2,3,4
刊名	CHINESE PHYSICS LETTERS
	2022
卷号	39 期号:1 页码:6
ISSN号	0256-307X
DOI	10.1088/0256-307X/39/1/011201
通讯作者	Xie, Ju-Jun(xiejujun@impcas.ac.cn)
英文摘要	The near-threshold e(+)e(-) -> Lambda(Lambda) over bar reaction is studied with the assumption that the production mechanism is due to a near-Lambda Lambda-threshold bound state. The cross section of the e(+)e(-) -> Lambda Lambda reaction is parameterized in terms of the electromagnetic form factors of.. hyperon, which are obtained with the vector meson dominance model. It is shown that the contribution to the e(+)e(-) -> Lambda(Lambda) over bar reaction from a new narrow state with quantum numbers J(PC) = 1(--) is dominant for energies very close to threshold. The mass of this new state is around 2231MeV, which is very close to the mass threshold of Lambda(Lambda) over bar, while its width is just a few MeV. This gives a possible solution to the problem that all previous calculations seriously underestimated the near-threshold total cross section of the e(+)e(-) -> Lambda(Lambda) over bar reaction. We also note that the near-threshold enhancement can also be reproduced by including these well established vector resonances omega(1420), omega(1650), phi(1680), or phi(2170) with a Flatt ' e form for their total decay width, and a strong coupling to the Lambda(Lambda) over bar channel.
资助项目	National Natural Science Foundation of China[12075288] ; National Natural Science Foundation of China[11735003] ; National Natural Science Foundation of China[11961141012] ; Youth Innovation Promotion Association CAS
WOS关键词	E(+)E(-) ; Y(2175) ; STATE
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000748224700001
资助机构	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/142278]
专题	中国科学院近代物理研究所
通讯作者	Xie, Ju-Jun
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 101408, Peoples R China 3.Zhengzhou Univ, Sch Phys & Microelect, Zhengzhou 450001, Peoples R China 4.Lanzhou Univ, Lanzhou Ctr Theoret Phys, Key Lab Theoret Phys Gansu Prov, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhong-Yi,Dai, An-Xin,Xie, Ju-Jun. Electromagnetic Form Factors of Lambda Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e(+)e(-)->Lambda(Lambda)over-bar over bar Reaction[J]. CHINESE PHYSICS LETTERS,2022,39(1):6.
APA	Li, Zhong-Yi,Dai, An-Xin,&Xie, Ju-Jun.(2022).Electromagnetic Form Factors of Lambda Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e(+)e(-)->Lambda(Lambda)over-bar over bar Reaction.CHINESE PHYSICS LETTERS,39(1),6.
MLA	Li, Zhong-Yi,et al."Electromagnetic Form Factors of Lambda Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e(+)e(-)->Lambda(Lambda)over-bar over bar Reaction".CHINESE PHYSICS LETTERS 39.1(2022):6.