A Nonperturbative Study of Quarkonium Systems

Details A Nonperturbative Study of Quarkonium Systems A Nonperturbative Study of Quarkonium Systems

1995-04-20

arxiv.org/abs/hep-ph/9504344v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages + 2 figures. They are included in one ps-file. uuencoded and compressed

Scientific paper

Using Nonrelativistic QCD on the lattice we studied the mass spectrum of quarkonium systems nonperturbatively for a range of the bar quark mass. We determined two products of the matrix elements involved in quarkonium decays and studied the mass dependence of the results. We predict from our calculations the leptonic decay width of $\Upsilon$, and use the mass dependence to predict the leptonic decay width of $J/\psi$. These calculations agree with the experimental results. In lattice NRQCD an additional parameter $n$ is introduced, and we study the sensitivity of our results to the choice of $n$.

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