このエントリーをはてなブックマークに追加
ID 14441
本文ファイル
Thumnail e054504.pdf 227 KB
著者
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
Shanahan, H. P.
Ukawa, A
Yoshie, T
キーワード
B meson decay constant
lattice QCD
NDC
物理学
抄録(英)
We present a study of leptonic B meson decay constants in lattice QCD with two flavors (Nf=2) of light dynamical quarks using nonrelativistic QCD for the heavy quark. Gauge configurations are generated with a renormalization-group improved gauge action and a mean-field-improved clover light quark action. Measurements are carried out at two values of β=6/g2, each for four sea quark masses, corresponding to inverse lattice spacings a-1≈1.3 and 1.8 GeV in the chiral limit of the sea quark. The continuum values of the decay constants are derived by evaluating the discretization errors at each finite lattice spacing. We find fBNf=2=204(8)(29)(+44) MeV, fBsNf=2=242(9)(34)(+38) MeV, and fBsNf=2/fBNf=2=1.179(18)(23), where the errors listed are statistical, systematic and uncertainty due to choice of the physical quantity used to fix the scale. Comparison is made to quenched results (Nf=0) obtained with the same action combination and matching lattice spacings. We find fBNf=2/fBNf=0=1.07(5), fBsNf=2/fBsNf=0=1.10(5) and (fBs/fB)Nf=2/(fBs/fB)Nf=0=1.03(2), which indicate a 5–10 0ncrease in the values of the decay constants, but no appreciable change in the ratio fBs/fB, due to sea quarks.
掲載誌名
Physical Review D
64巻
5号
開始ページ
054504
出版年月日
2001-09
出版者
American Physical Society
ISSN
1550-7998
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2001 American Physical Society
関連情報URL
部局名
理学研究科