  We calculate the one loop renormalisation parameters for the heavy-light
axial-vector and vector currents using lattice perturbation theory. We use
NonRelativistic QCD (NRQCD) heavy quarks and the Highly Improved Staggered
Quark (HISQ) action for the light quarks. We present results for heavy-light
currents with massless HISQ quarks and briefly discuss the extension to
heavy-heavy currents with massive HISQ quarks.
