The Spectrum from Lattice NRQCD

Abstract

I review recent results for heavy-heavy spectroscopy using Lattice NRQCD. The NRQCD collaboration reports that spin-independent splittings for the ${\rm Y}$ are scaling for a sensible range of $\beta$ values in the quenched approximation. Spin-dependent splittings are not, if the scale is set by spin-independent splittings. Results which include higher order spin-dependent relativistic and discretisation corrections show differences from previous (NRQCD collaboration) results without these. As expected, the differences are small for ${\rm Y}$ but rather large for charmonium. New results from the SESAM collaboration for ${\rm Y}$ spectroscopy on configurations with Wilson dynamical fermions show good agreement with previous results on HEMCGC configurations with staggered dynamical fermions.

Comments: 10 pages, Latex. 10 figures, 7 in postscript. Review for Tsukuba workshop