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arXiv 1001.4783hep-lat
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1/m级的HQET:I.淬火近似中的非微扰参数

HQET at order 1/m: I. Non-perturbative parameters in the quenched approximation

Benoît Blossier, Michele Della Morte, Nicolas Garron, Rainer Sommer

摘要:

我们确定非微扰的参数的晶格HQET拉格朗日和那些的时间分量的重轻轴矢量电流在淬火近似。HQET展开式包括1/m阶项。我们的结果允许计算,例如,重轻光谱和B介子衰变常数的静态近似和1/m的HQET。参数的确定分为通用和非通用部分。通用的结果可以用来确定各种离散化的参数。本文的计算采用了HQET所描述的b夸克的元格规范作用量和“HYP 1/2”作用量。电流的参数也依赖于光夸克作用,我们选择非微扰O(a)-改进的威尔逊费米子。

英文摘要:

We determine non-perturbatively the parameters of the lattice HQET Lagrangian and those of the time component of the heavy-light axial-vector current in the quenched approximation. The HQET expansion includes terms of order 1/m. Our results allow to compute, for example, the heavy-light spectrum and B-meson decay constants in the static approximation and to order 1/m in HQET. The determination of the parameters is separated into universal and non-universal parts. The universal results can be used to determine the parameters for various discretizations. The computation reported in this paper uses the plaquette gauge action and the "HYP1/2" action for the b-quark described by HQET. The parameters of the current also depend on the light-quark action, for which we choose non-perturbatively O(a)-improved Wilson fermions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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