Analysis of the strong coupling form factors of bNB andcND in QCD sum rules

  • 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 GbNB=0.43±0.01 GeV-1 and GcND=3.76±0.05 GeV-1.
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Guo-Liang Yu, Zhi-Gang Wang and Zhen-Yu Li. Analysis of the strong coupling form factors of bNB andcND in QCD sum rules[J]. Chinese Physics C, 2017, 41(8): 083104. doi: 10.1088/1674-1137/41/8/083104
Guo-Liang Yu, Zhi-Gang Wang and Zhen-Yu Li. Analysis of the strong coupling form factors of bNB andcND in QCD sum rules[J]. Chinese Physics C, 2017, 41(8): 083104.  doi: 10.1088/1674-1137/41/8/083104 shu
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Received: 2017-03-14
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    Supported by Fundamental Research Funds for the Central Universities (2016MS133)

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Analysis of the strong coupling form factors of bNB andcND in QCD sum rules

    Corresponding author: Guo-Liang Yu,
    Corresponding author: Zhi-Gang Wang,
  • 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
Fund Project:  Supported by Fundamental Research Funds for the Central Universities (2016MS133)

Abstract: 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 GbNB=0.43±0.01 GeV-1 and GcND=3.76±0.05 GeV-1.

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