Improved wave function for heavy-light mesons in QCD potential model approach and parameterization of the Cornell potential

We report improved wave function for mesons in QCD potential model approach using multiplicative method for solution of Schr\"odinger equation for the extreme cases of inter-quark separations (r0 and r). Using the wave function we find the range of the scale factor c of the Cornell potential with reference to the mass scale of B and D sectors heavy-flavoured mesons. With our computed range of c, we also explore the critical inter-quark separation which should govern the choice of parent-child terms in perturbation method out of the linear and Coulombic terms of the Cornell potential.