Decay constants of B and D mesons from improved relativistic lattice QCD with two flavors of sea quarks
Physical Review D 64 巻
034505- 頁
2001 発行
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タイトル ( eng ) |
Decay constants of B and D mesons from improved relativistic lattice QCD with two flavors of sea quarks
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作成者 |
Ali Khan A
Aoki S
Burkhalter B
Ejiri S
Fukugita M
Hashimoto S
Ishizuka N
Iwasaki Y
Kanaya K
Kaneko T
Kuramashi Y
Manke T
Nagai K
Shanahan H. P.
Ukawa A
Yoshié T
CP-PACS Collaboration
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収録物名 |
Physical Review D
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巻 | 64 |
開始ページ | 034505 |
抄録 |
We present a calculation of the B and D meson decay constants in lattice QCD with two (Nf=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 mPS/mV≈0.8-0.6. Our provisional estimate for the continuum values of the decay constants are fBd=208(10)(29) MeV, fBs=250(10)(35)(-0+8) MeV, fDd=225(14)(40) MeV, fDs=267(13)(48)(-0+10) MeV for Nf=2 where the statistical and systematic errors are separately listed, and the third error for fBs and fDs 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 Nf=2 and Nf=0, we obtain fBdNf=2/fBdNf=0=1.11(6),fBsNf=2/fBsNf=0=1.14(5),fDdNf=2/fDdNf=0=1.03(6),fDsNf=2/fDsNf=0=1.07(5). They show a 10–15 0ncrease in the Nf=2 results over those of Nf=0 for the B meson decay constants, while evidence for such a trend is statistically less clear for the D meson decay constants.
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NDC分類 |
物理学 [ 420 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
The American Physical Society
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発行日 | 2001 |
権利情報 |
Copyright (c) 2001 The American Physical Society
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出版タイプ | Version of Record(出版社版。早期公開を含む) |
アクセス権 | オープンアクセス |
収録物識別子 |
[ISSN] 1550-7998
[DOI] 10.1103/PhysRevD.64.034505
[DOI] http://dx.doi.org/10.1103/PhysRevD.64.034505
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