Improved variational approach in semileptonic decay of B meson for the   Cornell potential
  We obtain the wave function of mesonic systems interacting via a Cornell potential by applying improved variational approach. We study Isgur-Wise function and its parameters. Then we report our calculations on the parameters of semileptonic decay of B and Bs mesons. B-->D*l$nu$ process is also investigated in this work. 
S. Rahmani and H. Hassanabadi
hep-ph