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

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

doi:10.1016/0370-2693(94)90781-1

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

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

Physics and Astronomy (Twin Cities)

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Abstract

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 am_q = 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 language	English (US)
Pages (from-to)	332-337
Number of pages	6
Journal	Physics Letters B
Volume	329
Issue number	2-3
DOIs	https://doi.org/10.1016/0370-2693(94)90781-1
State	Published - Jun 16 1994

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AU - Born, K. D.

AU - Laermann, E.

AU - Walsh, T. F.

AU - Zerwas, P. M.

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N2 - 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.

AB - 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.

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

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