Analysis of the strong coupling form factors of Sigma N-b B and Sigma N-c D in QCD sum rules

作者：Yu, Guo-Liang^*; Wang, Zhi-Gang; Li, Zhen-Yu

来源：Chinese Physics C, 2017, 41(8): 083104.

DOI：10.1088/1674-1137/41/8/083104

• sum rules
• coupling constants
• baryons

In this article, we study the strong interaction of the vertices Sigma bNB and Sigma cND 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(Sigma bNB) = 0.43 +/- 0.01 GeV-1 and G(Sigma cND) = 3.76 +/- 0.05 GeV-1.

• 出版日期2017-8
• 单位华北电力大学; 贵州师范学院; 华北电力大学（保定）