Form factors and charge radii in a QCD inspired potential model using   the Variationally Improved Perturbation Theory (VIPT)
  We use VIPT in calculating the elastic form factors and charge radii of D, Ds, B, Bs and Bc mesons in a QCD inspired potential model. For that we use linear cum Coulombic potential and opt firstly the Coulombic part as parent and then linear part as parent.The results show that charge radii and form factors are quite small for Coulombic parent case than the linear parent. Also, the analysis leads to a lower as well as upper bound on the four momentum transfer Q2 hinting at a workable range of Q2 within this approach which may be useful in future for experimental analysis. Comparision of both the options prefer the linear parent. 
B. J. Hazarika (Pandu College, Guwahati, India), D. K. Choudhury   (Gauhati University, Guwahati, India)
hep-ph