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2+1 flavor lattice QCD toward the physical point
http://hdl.handle.net/2241/102508
http://hdl.handle.net/2241/10250853e4a87b-28f8-40fe-a204-29f18bce2b86
名前 / ファイル | ライセンス | アクション |
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PRD_79-03.pdf (1.2 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2009-05-15 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | 2+1 flavor lattice QCD toward the physical point | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
著者 |
Aoki, S.
× Aoki, S.× Ishikawa, K.-I.× Ishizuka, N.× Izubuchi, T.× Kadoh, D.× Kanaya, K.× Kuramashi, Y× Namekawa, Y.× Okawa, M.× Taniguchi, Y.× Ukawa, A.× Ukita, N.× Yoshie´, T. |
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著者別名 |
青木, 愼也
× 青木, 愼也× 石塚, 成人× 金谷, 和至× 藏増, 嘉伸× 谷口, 裕介× 宇川, 彰× 吉江, 友照 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We present the first results of the PACS-CS project which aims to simulate 2+1 flavor lattice QCD on the physical point with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action. Numerical simulations are carried out at beta=1.9, corresponding to the lattice spacing of a=0.0907(13) fm, on a 323×64 lattice with the use of the domain-decomposed HMC algorithm to reduce the up-down quark mass. Further algorithmic improvements make possible the simulation whose up-down quark mass is as light as the physical value. The resulting pseudoscalar meson masses range from 702 MeV down to 156 MeV, which clearly exhibit the presence of chiral logarithms. An analysis of the pseudoscalar meson sector with SU(3) chiral perturbation theory reveals that the next-to-leading order corrections are large at the physical strange quark mass. In order to estimate the physical up-down quark mass, we employ the SU(2) chiral analysis expanding the strange quark contributions analytically around the physical strange quark mass. The SU(2) low energy constants [overline l]3 and [overline l]4 are comparable with the recent estimates by other lattice QCD calculations. We determine the physical point together with the lattice spacing employing mpi, mK and mOmega as input. The hadron spectrum extrapolated to the physical point shows an agreement with the experimental values at a few % level of statistical errors, albeit there remain possible cutoff effects. We also find that our results of fpi, fK and their ratio, where renormalization is carries out perturbatively at one loop, are compatible with the experimental values. For the physical quark masses we obtain mud[overline MS] and ms[overline MS] extracted from the axial-vector Ward-Takahashi identity with the perturbative renormalization factors. We also briefly discuss the results for the static quark potential. | |||||
言語 | en | |||||
書誌情報 |
en : Physical review D 巻 79, 号 03, p. 034503, 発行日 2009-02 |
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ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 2470-0010 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00773624 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1103/PhysRevD.79.034503 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | c 2009 The American Physical Society | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | The American Physical Society | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2241/102508 | |||||
識別子タイプ | HDL |