COMPUTATION OF THE HEAVY-LIGHT DECAY CONSTANT USING NONRELATIVISTIC LATTICE QCD

被引：30
作者：
HASHIMOTO, S
机构：
[1] Department of Physics, Hiroshima University, Higashi-Hiroshima
来源：
PHYSICAL REVIEW D | 1994年 / 50卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.50.4639
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report results on a lattice calculation of the heavy-light meson decay constant employing the nonrelativistic QCD approach for heavy quarks and the Wilson action for light quarks. Simulations are carried out at beta = 6.0 on a 16(3) x 48 lattice. The signal to noise ratio for the ground state is significantly improved compared to simulations in the static approximation, enabling us to extract the decay constant reliably. We compute the heavy-light decay constant for several values of heavy quark mass and estimate the magnitude of the deviation from the heavy mass scaling law f(P) square-rootm(P) = const. For the B meson we find f(B) = 171 +/- 22(-45)+19 MeV, while an extrapolation to the static limit yields f(B)static = 297 +/- 36(-30)+15 MeV.
引用
收藏
页码：4639 / 4648
页数：10
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