Topological susceptibility in lattice QCD with two flavors of dynamical quarks
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ID | 18657 |
本文ファイル | |
著者 |
Arifa, Ali Khan
Aoki, Sinya
Burkhalter, Rudolf
Ejiri, Shinji
Fukugita, Masataka
Hashimoto, Shoji
Ishizuka, Naruhito
Iwasaki, Yoichi
Kanaya, Kazuyuki
Kaneko, Takashi
Kuramashi, Yoshinobu
Manke, Thomas
Nagai, Keiichi
Shanahan, Hugh P.
Ukawa, Akira
Yoshie, Tomoteru
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抄録(英) | We present a study of the topological susceptibility in lattice QCD with two degenerate flavors of dynamical quarks. The topological charge is measured on gauge configurations generated with a renormalization group improved gauge action and a mean field improved clover quark action at three values of β=6/g2 with four sea quark masses at each β. The lattice spacings at these β's are a≈0.22, 0.16 and 0.11 fm at the physical up and down quark mass, which are fixed by the physical ρ meson mass. The study is supplemented by simulations of pure SU(3) gauge theory with the same gauge action at 5 values of β with lattice spacings 0.09 fm?a ?0.27 fm. We employ a field-theoretic definition of the topological charge together with cooling. For the topological susceptibility in the continuum limit of pure SU(3) gauge theory we obtain χt1/4= 197-16+13 MeV where the error shows statistical and systematic ones added in quadrature. In full QCD χt at heavy sea quark masses is consistent with that of pure SU(3) gauge theory. A decrease of χt toward light quark masses, as predicted by the anomalous Ward-Takahashi identity for U(1) chiral symmetry, becomes clearer for smaller lattice spacings. The cross over in the behavior of χt from heavy to light sea quark masses is discussed.
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掲載誌名 |
Physical review D
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巻 | 64巻
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号 | 11号
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開始ページ | 114501-1
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終了ページ | 114501-10
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出版年月日 | 2001-10-19
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出版者 | American Physical Society
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ISSN | 1550-7998
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NCID | |
出版者DOI | |
言語 |
英語
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NII資源タイプ |
学術雑誌論文
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広大資料タイプ |
学術雑誌論文
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DCMIタイプ | text
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フォーマット | application/pdf
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著者版フラグ | publisher
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権利情報 | Copyright (c) 2001 American Physical Society.
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関連情報URL | |
部局名 |
理学研究科
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