The quasiclassical theory of the Dirac equation with a scalar-vector interaction and its applications in the theory of heavy-light mesons

Abstract

We construct a relativistic potential quark model of $D$, $D_s$, $B$, and $B_s$ mesons in which the light quark motion is described by the Dirac equation with a scalar-vector interaction and the heavy quark is considered a local source of the gluon field. The effective interquark interaction is described by a combination of the perturbative one-gluon exchange potential $V_{\mathrm{Coul}}(r)=-\xi /r$ and the long-range Lorentz-scalar and Lorentz-vector linear potentials $S_{l.r.}(r)=(1-\lambda )(\sigma r+V_0)$ and $V_{l.r.}(r)=\lambda (\sigma r+V_0)$, where $0⩽\lambda <1/2$. Within the quasiclassical approximation, we obtain simple asymptotic formulas for the energy and mass spectra and for the mean radii of $D$, $D_s$, $B$, and $B_s$ mesons, which ensure a high accuracy of calculations even for states with the radial quantum number $n_r\sim 1$. We show that the fine structure of P-wave states in heavy-light mesons is primarily sensitive to the choice of two parameters: the strong-coupling constant ${\alpha }_s$ and the coefficient $\lambda$ of mixing of the long-range scalar and vector potentials $S_{l.r.}(r)$ and $V_{l.r.}(r)$. The quasiclassical formulas for asymptotic coefficients of wave function at zero and infinity are obtained.

Comments: 22 pages, 6 figures