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ID 14447
本文ファイル
著者
Aoki, S.
Fukugita, M.
Hashimoto, S.
Ishizuka, N.
Iwasaki, Y.
Kanaya, K.
Kaneko, T.
Kuramashi, Y.
Onogi, T.
Tsutsui, N.
Ukawa, A.
Yamada, N.
Yoshie, T.
キーワード
unquenched lattice calculation
Wilson fermion action
QCD
B0-anti-B0
NDC
物理学
抄録(英)
We present an unquenched lattice calculation for the B0-anti-B0 transition amplitude. The calculation, carried out at an inverse lattice spacing 1/a=2.22(4)GeV, incorporates two flavors of dynamical quarks described by the O(a)-improved Wilson fermion action and heavy quarks described by nonrelativistic QCD. Particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay constant, whereas it is small for the B parameters. We obtain fBd=191(10)(+12-22)MeV, fBs/fBd=1.13(3)(+13-2), BBd(mb)=0.836(27)(+56-62), BBs/BBd=1.017(16)(+56-17), and ξ=1.14(3)(+13-2), where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion, and perturbative operator matching.
掲載誌名
Physical Review Letters
91巻
21号
開始ページ
212001
出版年月日
2003-11
出版者
American Physical Society
ISSN
0031-9007
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