New Developments in Lattice QCD: Calculation of Flavor Singlet Nucleon Matrix Elements and Hadron Scattering Lengths

Abstract

Recent developments in lattice QCD calculation of flavor singlet nucleon matrix elements are reviewed. Substantial sea quark contributions are found in the $\pi$-$N\sigma$ term and the quark spin content of the nucleon such that the total magnitude including valence contributions is in reasonable agreement with experiments. Some problems with flavor non-singlet nucleon matrix elements are pointed out. Recent work on lattice QCD calculation of hadron scattering length is also discussed.

Plenary talk given at the International Symposium on Lattice Field Theory {\it LATTICE 95}, Melbourne, Australia, 11-15 July, 1995, 12pages, 15 Postscript figures

References in corpus (6)

• Resonance Scattering Phase Shifts on a Non-Rest Frame Lattice
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• Stochastic Estimation with $Z_2$ Noise
• FLAVOR-SINGLET g_A FROM LATTICE QCD
• Proton Spin Structure from Lattice QCD
• An Exploratory Study of Nucleon-Nucleon Scattering Lengths in Lattice QCD

Cited by in corpus (3)

• On the low fermionic eigenmode dominance in QCD on the lattice
• Valence QCD: Connecting QCD to the Quark Model
• Strangeness Content in the Nucleon