The heavy quark's self energy from moving NRQCD on the lattice
  We present a calculation of the heavy quark's self energy in moving NRQCD to one-loop in perturbation theory. Results for the energy shift and external momentum renormalisation are discussed and compared with non-perturbative results. We show that the momentum renormalisation is small, which is the result of a remnant of re-parameterisation invariance on the lattice. 
A. Dougall, C. T. H. Davies, K. M. Foley, G. P. Lepage