Sea-quark effects in nucleon structure

Shao Jing Dong, Keh Fei Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We report results of our calculation on the π N σ term and the flavor-singlet axial charge of the nucleon in the framework of quenched lattice QCD. The disconnected insertions which involve contributions from the sea quarks are evaluated with the stochastic estimator with the Z2 noise which yields minimum variances. We find the sea-quark contribution to the πN sigma term to be∼ 1 2 - 1 4 of that of the dynamical fermion calculation. Whereas, the sea-quark contribution to the flavor-singlet gA is negative and large enough to cancel the valence (connected insertion) contribution substantially to resolve the "proton spin crisis".

Original languageEnglish
Pages (from-to)487-490
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Issue numberC
StatePublished - Mar 1993

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics


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