Instantons and spin forces between massive quarks

F. Wilczek, A. Zee

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


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 Jψ(3100) and ηc(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.

Original languageEnglish (US)
Pages (from-to)83-86
Number of pages4
JournalPhysical Review Letters
Issue number2
StatePublished - 1978
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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