@article{oai:tsukuba.repo.nii.ac.jp:00009394,
 author = {Fukugita, M. and Kuramashi, Y. and Okawa, M. and Ukawa, A. and 宇川, 彰},
 issue = {9},
 journal = {Physical review D},
 month = {May},
 note = {We calculate both the connected and disconnected contributions to the π-N σ term in quenched lattice QCD with the Wilson quark action on a 12^3×20 lattice at β=5.7 with the lattice spacing a=0.14 fm. The latter is evaluated with the variant wall source method, previously applied successfully for π-π scattering lengths and the η’ meson mass. We found the disconnected contribution to be about twice as large as the connected one. The value for the full π-N σ term σ=40-60 MeV is consistent with the experimental estimates. The nucleon matrix element of the strange quark density s￣s is fairly large in our result.},
 pages = {5319--5322},
 title = {Pion-nucleon σ term in lattice QCD},
 volume = {51},
 year = {1995}
}