3,570 research outputs found

    Analysis of the strong vertices of ΣcND\Sigma_cND^{*} and ΣbNB\Sigma_bNB^{*} in QCD sum rules

    Full text link
    The strong coupling constant is an important parameter which can help us to understand the strong decay behaviors of baryons. In our previous work, we have analyzed strong vertices ΣcND\Sigma_{c}^{*}ND, ΣbNB\Sigma_{b}^{*}NB, ΣcND\Sigma_{c}ND, ΣbNB\Sigma_{b}NB in QCD sum rules. Following these work, we further analyze the strong vertices ΣcND\Sigma_{c}ND^{*} and ΣbNB\Sigma_{b}NB^{*} using the three-point QCD sum rules under Dirac structures q ⁣ ⁣ ⁣/p ⁣ ⁣ ⁣/γαq\!\!\!/p\!\!\!/\gamma_{\alpha} and q ⁣ ⁣ ⁣/p ⁣ ⁣ ⁣/pαq\!\!\!/p\!\!\!/p_{\alpha}. In this work, we first calculate strong form factors considering contributions of the perturbative part and the condensate terms qq\langle\overline{q}q\rangle, αsπGG\langle\frac{\alpha_{s}}{\pi}GG\rangle and qgsσGq\langle\overline{q}g_{s}\sigma Gq\rangle. Then, these form factors are used to fit into analytical functions. According to these functions, we finally determine the values of the strong coupling constants for these two vertices ΣcND\Sigma_{c}ND^{*} and ΣbNB\Sigma_{b}NB^{*}.Comment: arXiv admin note: text overlap with arXiv:1705.0322
    corecore