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Flavor singlet meson mass in the continuum limit in two-flavor lattice QCD
Lesk, V. I.
Aoki, S.
Burkhalter, R.
Fukugita, M.
Ishikawa, K.-I.
Ishizuka, N.
Iwasaki, Y.
岩崎, 洋一
Kanaya, K.
Kuramashi, Y.
Okawa, M.
Taniguchi, Y.
Ukawa, A.
宇川, 彰
Umeda, T.
Yoshie, T.
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.
journal article
American Physical Society
2003-04
application/pdf
Physical review D
7
67
074503
http://hdl.handle.net/2241/89326
2470-0010
AA00773624
https://tsukuba.repo.nii.ac.jp/record/7782/files/PRD_67-7.pdf
eng
https://doi.org/10.1103/PhysRevD.67.074503
(c) 2003 The American Physical Society
open access