We describe a calculation of heavy-light decay constants including virtual quark loop effects. We have generated dynamical gauge configurations at three β values using two flavors of Kogut-Susskind quarks with a range of masses. These are analyzed with a Wilson valence quark action. Preliminary results based on a ``fat-link'' clover valence quark action are also reported. Results from the two methods differ by 30 to 50 MeV, which is presumably due to significant - but as yet unobserved - lattice spacing dependence in one or both of the approaches.
@article{arxiv.hep-lat/9909121,
title = {Heavy-Light Decay Constants with Dynamical Gauge Configurations and Wilson or Improved Valence Quark Action},
author = {MILC Collaboration and Claude Bernard and Thomas DeGrand and Carleton DeTar and Steven Gottlieb and Urs M. Heller and James E. Hetrick and Craig McNeile and Kostas Orginos and Robert L. Sugar and Douglas Toussaint},
journal= {arXiv preprint arXiv:hep-lat/9909121},
year = {2009}
}