Analysis of the strong coupling form factors of ∑bNB and ∑cND in QCD sum rules

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2017,（8）
• 页码范围: 39-46
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1137/41/8/083104

摘要

In this article,we study the strong interaction of the vertices ∑bNB and ∑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∑bNB =0.43±0.01 GeV-1 and G∑cND=3.76±0.05 GeV-1.