Analysis of the strong coupling form factors of ΣbNB and ΣcND in QCD sum rules *Supported by Fundamental Research Funds for the Central Universities (2016MS133). (August 2017) - Yu 于, Guo-Liang 国梁
Abstract: In this article, we study the strong interaction of the vertices Σ b NB and Σ c ND 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 Σb NB = 0.43±0.01 GeV −1 and G Σc ND = 3.76±0.05 GeV −1 .