The D-dimensional Klein–Gordon (KG) wave equation with unequal scalar and timelike
vector Cornell interactions was solved by the Laplace transform method. We
have obtained the bound state energy eigenvalues of the spinless relativistic heavy
quarkonium systems under such a potential. Further, the stationary states are calculated
due to the well behavior of wave functions at the origin and at infinity. The statistical
properties of this model were also investigated. Our results have been found to be of
great importance in particle physics