Nf=2模拟的B介子谱和衰变常数
B meson spectrum and decay constant from Nf=2 simulations
摘要：
我们报告的一个ALPHA协作项目的状态，以提取数量的B物理现象学从Nf=2晶格模拟。该框架是重夸克有效理论（HQET）扩展到一阶的逆b夸克质量。有效理论的耦合是通过将HQET中计算的观测量与QCD中计算的观测量相匹配来确定的。该程序基于在具有SF边界条件的小物理体积中的Nf=2模拟，现在几乎完成。另一方面，从CLS系综中选择的配置的分析，以测量HQET强子矩阵元素，最近刚刚开始，以便只在一个单一的晶格间距，a=0.07 FM，将讨论获得的结果。我们给出了我们的第一个结果的b-夸克质量和B介子衰变常数。
英文摘要：
We report on the status of an ALPHA Collaboration project to extract quantities for B physics phenomenology from Nf=2 lattice simulations. The framework is Heavy Quark Effective Theory (HQET) expanded up to the first order of the inverse b-quark mass. The couplings of the effective theory are determined by imposing matching conditions of observables computed in HQET with their counterpart computed in QCD. That program, based on Nf=2 simulations in a small physical volume with SF boundary conditions, is now almost finished. On the other side the analysis of configurations selected from the CLS ensembles, in order to measure HQET hadronic matrix elements, has just started recently so that only results obtained at a single lattice spacing, a=0.07 fm, will be discussed. We give our first results for the b-quark mass and for the B meson decay constant.
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