Bottomonium from NRQCD with Dynamical Wilson Fermions
A. Spitz, N. Eicker, J. Fingberg, S. Güsken, H. Hoeber, Th. Lippert, K. Schilling, J. Viehoff
Abstract
We present results for the b b spectrum obtained using an O(Mbv6)-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.
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