论文标题
使用晶格QCD计算包容性衰减率
Towards the computation of inclusive decay rates using lattice QCD
论文作者
论文摘要
我们提出了从晶格QCD模拟的重膜衰变的包含率的非扰动计算。该计算基于从JLQCD和ETM协作的配置集合计算出的四点欧几里得相关函数获得的涂抹光谱函数的提取。我们将包含衰减率的结果与操作员产品扩展的分析预测进行了比较，从而为计算包含性衰减率找到了良好的一致性。这为Cabibbo-Kobayashi-Maskawa矩阵元素$ v_ {cb} $的理论确定的理论确定开辟了道路，以达到与当前的实验不确定性的精确竞争水平。
We present a non-perturbative computation of inclusive rates of semileptonic decays of heavy mesons from lattice QCD simulations. The calculation is based on the extraction of smeared spectral functions obtained from four-point Euclidean correlation functions computed on configuration ensembles of the JLQCD and ETM collaborations. We compare our results for the inclusive decay rates with analytical predictions from the operator-product expansion, finding a good agreement for the calculation of the inclusive decay rate. This opens the path to the theoretical determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $V_{cb}$ to a level of precision competitive with the present experimental uncertainty.
