B(0)-B(0) mixing in unquenched lattice QCD.
B(0)-B(0) mixing in unquenched lattice QCD.
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DOI：
10.1103/physrevlett.91.212001
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发表时间：
2003-07
影响因子：
8.6
通讯作者：
S. Aoki;M. Fukugita;S. Hashimoto;K. Ishikawa;N. Ishizuka;Y. Iwasaki;K. Kanaya;T. Kaneko;Y. Kuramashi;M. Okawa;T. Onogi;N. Tsutsui;A. Ukawa;N. Yamada;T. Yoshie
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文献类型：
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作者：
S. Aoki;M. Fukugita;S. Hashimoto;K. Ishikawa;N. Ishizuka;Y. Iwasaki;K. Kanaya;T. Kaneko;Y. Kuramashi;M. Okawa;T. Onogi;N. Tsutsui;A. Ukawa;N. Yamada;T. Yoshie
给出了B(0)-B(0)跃迁振幅的非猝灭晶格计算。在倒数晶格间距1/a=2.22(4)GeV下进行的计算，包含了由O(A)-改进的威尔逊费米子作用描述的两种类型的动力学夸克和由非相对论QCD描述的重夸克。我们特别注意了手征外推引起的不确定度，特别是对于轻夸克，我们发现对于轻子衰变常数，它可能是相当大的，而对于B参数，它是很小的。我们得到f(B(D))=191(10)(+12-22)MeV，f(B(S))/f(B(D))=1.13(3)(+13-2)，B(B(D))(m(B))=0.836(27)(+56-62)，B(B(S))/B(B(D))=1.017(16)(+56-17)，xi=1.14(3)(+13-2)，其中第一个误差是统计的，第二个是系统的，包括手征外推的不确定性，有限晶格间距、重夸克展开和微扰算符匹配。
We present an unquenched lattice calculation for the B(0)-B(0) 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 f(B(d))=191(10)(+12-22) MeV, f(B(s))/f(B(d))=1.13(3)(+13-2), B(B(d))(m(b))=0.836(27)(+56-62), B(B(s))/B(B(d))=1.017(16)(+56-17), and xi=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.