Progress calculating decay constants with NRQCD and AsgTad actions

Abstract We combine a light AsgTad antiquark with a nonrelativistic heavy quark to compute the decay constants of heavy-light pseudoscalar mesons using the ensemble of 3-flavor gauge field configurations generated by the MILC collaboration. Preliminary results for f B s and f D s are given and status of the chiral extrapolation to f B is reported. We also touch upon results of the perturbative calculation which matches matrix elements in the effective theory to the full theory at 1-loop order.