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The spectrum of the {Υ} system is investigated using the nonrelativistic lattice QCD approach to heavy quarks and ignoring light quark vacuum polarization. We find good agreement with experiment for the {Υ},{Υ}',{Υ}'' and for the center of mass and fine structure of the χb states. The lattice calculations predict bb{} D states with a center of mass at (10.20±{}0.07±{}0.03) GeV. Fitting procedures aimed at extracting both ground and excited state energies are developed. We calculate a nonperturbative dispersion mass for the {Υ}(1S) and compare it with tadpole-improved lattice perturbation theory.
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Davies et al. (1994) studied this question.
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