论文标题
lattice QCD的包含半雌科$ b $ -
Inclusive semileptonic $B$-decays from lattice QCD
论文作者
论文摘要
我们介绍包含半蛋白质的晶格QCD计算$ b_s $ -Meson衰变。我们遵循最近提出的方法，该方法基于从欧几里得相关函数中提取涂片的光谱密度以及与包含衰减速率计算相关的积分内核的数值重建。我们使用JLQCD和ETM Gauge合奏计算四点欧几里得相关函数，该合奏具有非晶体的$ B $ QUARK-QUARK-QUARK MOSSES，并应用两种不同的方法来集成内核重建。最后，我们表明，这项工作中获得的晶格结果与操作员产物扩张的分析预测非常吻合。这为未来的完整晶格QCD计算开辟了道路，用于确定CKM元素$ v_ {cb} $的大小的理论输入。
We present the lattice QCD calculation of inclusive semileptonic $B_s$-meson decays. We follow a recently proposed method, which is based on the extraction of smeared spectral densities from Euclidean correlation functions and on the numerical reconstruction of the integration kernel relevant for the inclusive decay rate calculation. We compute four-point Euclidean correlation functions using JLQCD and ETM gauge ensembles with unphysically light $b$-quark masses, and apply two different methods for the integration kernel reconstruction. Finally, we show that the lattice results obtained in this work are in good agreement with the analytic predictions of the operator-product-expansion. This opens the path for a future full lattice QCD calculation to be used as theoretical input for the determination of the magnitude of the CKM element $V_{cb}$.
