Vector and axial-vector couplings of D and D* mesons in 2+1 flavor   Lattice QCD
  Using the axial-vector coupling and the electromagnetic form factors of the D and D* mesons in 2+1 flavor Lattice QCD, we compute the D*D\pi, DD\rho and D*D*\rho coupling constants, which play an important role in describing the charm hadron interactions in terms of meson-exchange models. We also extract the charge radii of D and D* mesons and determine the contributions of the light and charm quarks separately. 
K. U. Can, G. Erkol, M. Oka, A. Ozpineci, T. T. Takahashi
hep-lat hep-ph