摘要：In this study, the coupling constants of and vertices were determined within the three-point Quantum chromodynamics sum rules method with and without consideration of the symmetry. The coupling constants were calculated for off-shell charm and cases. Considering the nonperturbative effect of the correlation function, as the most important contribution, the quark-quark, quark-gluon, and gluon-gluon condensate corrections were estimated and were compared with other predictive methods.
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