Spin dependence of the heavy-quark potential: a QCD lattice analysis

K. D. Born, E. Laermann, T. F. Walsh, P. M. Zerwas

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We have investigated the spin dependence of the potential between heavy quarks in full lattice QCD, including the effects of light quark loops. The form of the spin-orbit, the tensor and the spin-spin forces present clear evidence for long-range scalar confinement supplemented by a Coulomb force at short distances. This agrees with observations from quarkonium spectroscopy. The QCD simulation has been carried out for Kogut-Susskind fermions with four degrees of freedom at a gauge coupling β = 5.35 and a quark mass amq = 0.01 on a 163 × 24 size lattice. This corresponds to a lattice spacing 0.12 fm, a spatial lattice size of about 2 fm and a light quark mass of 48 MeV.

Original languageEnglish (US)
Pages (from-to)332-337
Number of pages6
JournalPhysics Letters B
Issue number2-3
StatePublished - Jun 16 1994


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