@article{oai:tsukuba.repo.nii.ac.jp:00007782,
 author = {Lesk, V. I. and Aoki, S. and Burkhalter, R. and Fukugita, M. and Ishikawa, K.-I. and Ishizuka, N. and Iwasaki, Y. and 岩崎, 洋一 and Kanaya, K. and Kuramashi, Y. and Okawa, M. and Taniguchi, Y. and Ukawa, A. and 宇川, 彰 and Umeda, T. and Yoshie, T.},
 issue = {7},
 journal = {Physical review D},
 month = {Apr},
 note = {We present results for the mass of the η′ meson in the continuum limit for two-flavor lattice QCD, calculated on the CP-PACS computer, using a renormalization-group-improved gauge action, and the Sheikoleslami-Wohlert fermion action with a tadpole-improved csw. The correlation functions are measured at three values of the coupling β corresponding to the lattice spacing a≈0.22, 0.16, 0.11 fm and for four values of the quark mass parameter κ corresponding to mπ/mρ≈0.8, 0.75, 0.7, 0.6. For each (β, κ) pair, 400?800 gauge configurations are used. The two-loop diagrams are evaluated using a noisy source method. We calculate η′ propagators using both smeared and local sources, and find that excited state contaminations are much reduced by smearing. A full analysis for the smeared propagators gives mη′=0.960(87)-0.248+0.036 GeV in the continuum limit, where the second error represents the systematic uncertainty coming from varying the functional form for chiral and continuum extrapolations.},
 title = {Flavor singlet meson mass in the continuum limit in two-flavor lattice QCD},
 volume = {67},
 year = {2003}
}