The Semileptonic $\bar{B}⟶Dl\bar{\nu }$ and $\overline{B_s}⟶D_{s}l\bar{\nu }$ Decays in Isgur-Wise Approach

We consider a combination of linear confining and Hulth'en potentials in the Hamiltonian and via the perturbation approach, report the corresponding Isgure-Wise function parameters. Next, we investigate the Isgur-Wise Function for $\bar{B}⟶Dl\bar{\nu }$ and $\overline{B_s}⟶D_{s}l\bar{\nu }$ semileptonic decays and report the decay width, branching ratio and $\mathrm{\mid }{V}_{cb}\mathrm{\mid }$ CKM matrix element. A comparison with other models and experimental values is included.