Charm physics with highly improved staggered quarks
  We use a relativistic highly improved staggered quark action to discretize charm quarks on the lattice. We calculate the masses and the dispersion relation for heavy-heavy and heavy-light meson states, and show that for lattice spacings below .1 fm, the discretization errors are at the few percent level. We also discuss the prospects for accurate calculations at the few percent level of f_D_s, f_D, and the leptonic width of the psi and phi. 
C.T.H. Davies, E. Follana, K. Hornbostel, G.P. Lepage, Q. Mason, H.   Trottier, J. Shigemitsu and K. Wong