We present results for the b \bar b spectrum obtained using an O(M_bv^6)-correct non-relativistic lattice QCD action. Propagators are evaluated on SESAM's three sets of dynamical gauge configurations generated with two flavours of Wilson fermions at beta = 5.6. Compared to a quenched simulation at equivalent lattice spacing we find better agreement of our dynamical data with experimental results in the spin-independent sector but observe no unquenching effects in hyperfine-splittings. To pin down the systematic errors we have also compared quenched results in different ``tadpole'' schemes and used a lower order action.
@article{arxiv.hep-lat/9709138,
title = {Bottomonium from NRQCD with Dynamical Wilson Fermions},
author = {A. Spitz and N. Eicker and J. Fingberg and S. Güsken and H. Hoeber and Th. Lippert and K. Schilling and J. Viehoff},
journal= {arXiv preprint arXiv:hep-lat/9709138},
year = {2009}
}