Instantons and Spin Forces between Massive Quarks
Frank WilczekColumbia University, New York, New York 10027, and The Institute for Advanced Study, Princeton, New Jersey 08540A. ZeeColumbia University, New York, New York 10027, and The Institute for Advanced Study, Princeton, New Jersey 08540
1978en
ABI
Abstract
A generalization of Wilson's loop prescription to include spin is proposed. Instantons are shown to generate a spin-spin interaction between quarks. The large splitting between $\frac{J}{\ensuremath{\psi}}(3100)$ and ${\ensuremath{\eta}}_{c}(2830)$ may, in fact, be dominated by this mechanism and thus may provide a vivid demonstration of the physical effects of instantons. Heuristic arguments are presented which explain the sign and form of the interaction.
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Cited by 20 references