B0-(B)over-bar0 mixing in unquenched lattice QCD -: art. no. 212001

被引：68

作者：

Aoki, S ^{[1
]}

Fukugita, M

Hashimoto, S

Ishikawa, KI

Ishizuka, N

Iwasaki, Y

Kanaya, K

Kaneko, T

Kuramashi, Y

Okawa, M

Onogi, T

Tsutsui, N

Ukawa, A

Yamada, N

Yoshié, T

机构：

[1] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan

[2] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[3] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[4] Univ Tsukuba, Ctr Computat Phys, Tsukuba, Ibaraki 3058577, Japan

[5] Hiroshima Univ, Dept Phys, Higashihiroshima 7398526, Japan

[6] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan

[7] Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.91.212001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present an unquenched lattice calculation for the B-0-(B) over bar (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(Bd)=191(10)((+12)(-22)) MeV, f(Bs)/f(Bd)=1.13(3)((+13)(-2)), B-Bd(m(b))=0.836(27)((+56)(-62)), B-Bs/B-Bd=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.

引用

页数：4

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