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Phenomenological potentials describe the quarkonium systems like Charmonia,Bottomonia and $B_c$ Meson. They give a good accuracy for the mass spectra. Inthe present work we extend one of our previous works in the central case byadding spin dependent terms to allow for relativistic corrections. By using noncentral terms, we get better accuracy than other previous theoreticalcalculation. In the present work, the mass spectra of the bound states of heavyquarks are studied within the framework of the non relativistic Schrodinger sequation. First, we solve Schrodinger's equation by Nikiforov Uvarov (NU)method. The energy eigenvalues are presented using a non central potential. Theresults obtained are in good agreement with the experiment and are better thanprevious theoretical estimates.

Spin splitting spectroscopy of heavy quark anti quark systems