Analysis of the strong coupling form factors of Σ_bNB and Σ_cND in QCD sum rules  

作　　者：Guo-Liang Yu Zhi-Gang Wang Zhen-Yu Li 于国梁;王志刚;李振宇(Department of Mathematics and Physics, North China Electric Power University;School of Physics and Electronic Science, Guizhou Normal College)

机构地区：[1]Department of Mathematics and Physics, North China Electric Power University, Baoding 071003, China [2]School of Physics and Electronic Science, Guizhou Normal College, Guiyang 550018, China

出　　处：《Chinese Physics C》2017年第8期39-46,共8页中国物理C（英文版）

基　　金：Supported by Fundamental Research Funds for the Central Universities(2016MS133)

摘　　要：In this article, we study the strong interaction of the vertices ΣbNB and ΣcND using the three-point QCD sum rules under two different Dirac structures. Considering the contributions of the vacuum condensates up to dimension 5 in the operation product expansion, the form factors of these vertices are calculated. Then, we fit the form factors into analytical functions and extrapolate them into time-like regions, which gives the coupling constants. Our analysis indicates that the coupling constants for these two vertices are G（ΣbNB）= 0.43±0.01 GeV^-1 and GΣcND=3.76±0.05 GeV^-1.In this article, we study the strong interaction of the vertices ΣbNB and ΣcND using the three-point QCD sum rules under two different Dirac structures. Considering the contributions of the vacuum condensates up to dimension 5 in the operation product expansion, the form factors of these vertices are calculated. Then, we fit the form factors into analytical functions and extrapolate them into time-like regions, which gives the coupling constants. Our analysis indicates that the coupling constants for these two vertices are G（ΣbNB）= 0.43±0.01 GeV^-1 and GΣcND=3.76±0.05 GeV^-1.

关 键 词：sum rules coupling constants BARYONS 

分 类 号：O572.34[理学—粒子物理与原子核物理]