Dirac bound-state spectra ofQQ¯,qq¯, andQq¯systems

The mass spectra of $Q\overline{Q}$, $q\overline{q}$, and $Q\overline{q}$ systems are studied in a unified manner in the Dirac equation with an equally mixed four-vector and scalar power-law potential of the form $V\left(r\right)={\mathrm{Ar}}^{0.1}+V_0$. It is found that with this potential, which describes the $\psi$, $\Upsilon$, and $\phi$ systems reasonably well, the current-mass values for the light quarks give an excellent fit to the spectra of $D$, $F$, and $B$ mesons.