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 πN σ 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 nonsinglet nucleon matrix elements are pointed out. Recent work on lattice QCD calculation of hadron scattering length is also discussed.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 March 1996
 DOI:
 10.1016/09205632(96)000412
 arXiv:
 arXiv:heplat/9510047
 Bibcode:
 1996NuPhS..47..160O
 Keywords:

 High Energy Physics  Lattice
 EPrint:
 Plenary talk given at the International Symposium on Lattice Field Theory {\it LATTICE 95}, Melbourne, Australia, 1115 July, 1995, 12pages, 15 Postscript figures