典型文献
Electromagnetic Form Factors of Λ Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e+e-→ Λ(Λ) Reaction
文献摘要：
The near-threshold e+e-→ Λ(Λ) reaction is studied with the assumption that the production mechanism is due to a near-Λ(Λ)-threshold bound state.The cross section of the e+e → Λ(Λ) reaction is parameterized in terms of the electromagnetic form factors of Λ hyperon,which are obtained with the vector meson dominance model.It is shown that the contribution to the e+e-→ Λ(Λ) reaction from a new narrow state with quantum numbers JPC =1-is dominant for energies very close to threshold.The mass of this new state is around 2231 MeV,which is very close to the mass threshold of Λ(Λ),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-→ Λ(Λ) reaction.We also note that the near-threshold enhancement can also be reproduced by including these well established vector resonances w(1420),w(1650),φ(1680),or φ(2170) with a Flatté form for their total decay width,and a strong coupling to the Λ(Λ) channel.
文献关键词：
中图分类号：
作者姓名：
Zhong-Yi Li;An-Xin Dai;Ju-Jun Xie
作者机构：
Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 101408,China;School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China;Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,Lanzhou University,Lanzhou 730000,China
文献出处：
引用格式：
[1]Zhong-Yi Li;An-Xin Dai;Ju-Jun Xie-.Electromagnetic Form Factors of Λ Hyperon in the Vector Meson Dominance Model and a Possible Explanation of the Near-Threshold Enhancement of the e+e-→ Λ(Λ) Reaction)[J].中国物理快报（英文版）,2022(01):19-24
A类：
Hyperon,Meson,Explanation,hyperon,Flatt
B类：
Electromagnetic,Form,Factors,Vector,Dominance,Model,Possible,Near,Threshold,Enhancement,e+e,Reaction,near,threshold,reaction,studied,assumption,that,production,mechanism,due,bound,state,cross,section,parameterized,terms,electromagnetic,form,factors,which,are,obtained,vector,meson,dominance,model,It,shown,contribution,from,new,narrow,quantum,numbers,JPC,dominant,energies,very,close,mass,this,around,MeV,while,its,width,just,few,This,gives,possible,solution,problem,all,previous,calculations,seriously,underestimated,total,We,also,note,enhancement,can,reproduced,by,including,these,well,established,resonances,their,decay,strong,coupling,channel
AB值：
0.555848
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