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Decay constants of B and D mesons from improved relativistic lattice QCD with two flavours of sea quarks
http://hdl.handle.net/10191/27634
http://hdl.handle.net/10191/27634835ee24e-34ab-4b19-b908-080430482a71
名前 / ファイル | ライセンス | アクション |
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64_3_034505.pdf (251.4 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2014-06-23 | |||||
タイトル | ||||||
タイトル | Decay constants of B and D mesons from improved relativistic lattice QCD with two flavours of sea quarks | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Decay constants of B and D mesons from improved relativistic lattice QCD with two flavours of sea quarks | |||||
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 | |||||
著者 |
Khan, A.Ali
× Khan, A.Ali× Aoki, S.× Burkhalter, R.× Ejiri, S.× Fukugita, M.× Hashimoto, S.× Ishizuka, N.× Iwasaki, Y.× Kanaya, K.× Kaneko, T.× Kuramashi, Y.× Manke, T.× Nagai, K.I.× Okawa, M.× Shanahan, H.P.× Ukawa, A.× Yoshie, T.× CP-PACS, Collaboration |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We present a calculation of the B and D meson decay constants in lattice QCD with two (N f =2) flavors of light dynamical quarks, using an O(a)-improved Wilson action for both light and heavy quarks and a renormalization-group improved gauge action. Simulations are made at three values of lattice spacing a=0.22,0.16,0.11 fm and four values of sea quark mass in the range m PS /m V ≈0.8-0.6. Our provisional estimate for the continuum values of the decay constants are f Bd =208(10)(29) MeV, f Bs =250(10)(35)( +8 -0 ) MeV, f Dd =225(14)(40) MeV, f Ds =267(13)(48)( +10 -0 ) MeV for N f =2 where the statistical and systematic errors are separately listed, and the third error for f Bs and f Ds shows the uncertainty of the determination of the strange quark mass. We also carry out a set of quenched simulations using the same action to make a direct examination of sea quark effects. Taking the ratio of results for N f =2 and N f =0, we obtain f N f =2 Bd /f N f =0 Bd =1.11(6),f N f =2 Bs /f N f =0 Bs =1.14(5),f N f =2 Dd /f N f =0 Dd =1.03(6),f N f =2 Ds /f N f =0 Ds =1.07(5). They show a 10–15 % increase in the N f =2 results over those of N f =0 for the B meson decay constants, while evidence for such a trend is statistically less clear for the D meson decay constants. | |||||
書誌情報 |
Physical Review D en : Physical Review D 巻 64, 号 3, p. 034505, 発行日 2001-07 |
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出版者 | ||||||
出版者 | American Physical Society | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 15507998 | |||||
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 | ||||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1103/PhysRevD.64.034505 | |||||
権利 | ||||||
権利情報 | (C) 2001 American Physical Society | |||||
著者版フラグ | ||||||
値 | publisher |