Strong coupling constant of vector bottomonium to the pseudoscalar and vector B

The strong coupling constant $$g_{\Upsilon B_c^{ps} B_c^V }$$ is evaluated using the three-point QCD sum rules. The correlation functions used to calculate these strong coupling constants contain contributions of both B c V and B c ps mesons as off-shell states with contributions of two gluon condensates as a radiative corrections. The results, $$g_{\Upsilon B_c^V B_c^{PS} } = 1.67 \pm 0.52$$ GeV−1 for B c Ps off-shell and $$g_{\Upsilon B_c^{PS} B_c^V } = \left( {0.87 \pm 0.25} \right)$$ GeV−1 for B c V off-shell are obtained for the relevant strong coupling constants