B meson decay constants from two-flavor lattice QCD with nonrelativistic heavy quarks -: art. no. 054504

被引:33
作者
Khan, AA [1 ]
Aoki, S
Burkhalter, R
Ejiri, S
Fukugita, M
Hashimoto, S
Ishizuka, N
Iwasaki, Y
Kanaya, K
Kaneko, T
Kuramashi, Y
Manke, T
Nagai, K
Okawa, M
Shanahan, HP
Ukawa, A
Yoshié, T
机构
[1] Univ Tsukuba, Ctr Computat Phys, Tsukuba, Ibaraki 3058577, Japan
[2] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan
[3] Univ Tokyo, Inst Cosm Ray Res, Chiba 2778582, Japan
[4] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
来源
PHYSICAL REVIEW D | 2001年 / 64卷 / 05期
关键词
D O I
10.1103/PhysRevD.64.054504
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a study of leptonic B meson decay constants in lattice QCD with two flavors (N-f = 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 beta = 6/g(2), each for four sea quark masses, corresponding to inverse lattice spacings a(-1) approximate to 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 f(B)(Nf = 2) = 204(8)(29)(+44) MeV, f(Bs)(Nf = 2) = 242(9)(34)(+38) MeV, and f(Bs)(Nf = 2)/f(B)(Nf = 2) = 1.179(18)(23), where the errors listed are statistical, systematic and uncertainty due to choice of the physical quantity used to flx the scale. Comparison is made to quenched results (N-f = 0) obtained with the same action combination and matching lattice spacings. We find f(B)(Nf = 2)/f(B)(Nf = 0) = 1.07(5), f(Bs)(Nf = 2)/f(Bs)(Nf = 0) = 1.10(5) and (f(Bs)/f(B))(Nf = 2)/(f(Bs)/f(B))(Nf = 0) = 1.03(2), which indicate a 5-10 % increase in the values of the decay constants, but no appreciable change in the ratio f(Bs)/f(B), due to sea quarks.
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