New methods for B decay constants and form factors from Lattice NRQCD
New methods for B decay constants and form factors from Lattice NRQCD
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来自 Lattice NRQCD 的 B 衰减常数和形状因子的新方法
DOI：
10.1051/epjconf/201817514021
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发表时间：
2018
影响因子：
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通讯作者：
Davies C
中科院分区：
文献类型：
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作者：
Davies C
我们确定了由非相对论性QCD（NRQCD）B夸克和高度改进交错（HISQ）轻夸克构成的标量和赝标量流算符通过O（αs <$QCD/mb）的归一化.我们使用这些运营商的矩阵元素提取B介子衰变常数和形状因子，并比较使用标准矢量和轴矢量运营商获得的。我们研究MILC第二代2+1+1胶子场配置，包括海洋中具有物理轻夸克的配置。这提供了一个测试系统的不确定性，在这些计算中，我们发现之间的协议的结果，以前引用的不确定性水平为2%。
We determine the normalisation of scalar and pseudo scalar current operators made from NonRelativistic QCD (NRQCD) b quarks and Highly Improved Staggered (HISQ) light quarks through O(αs∧QCD/mb). We use matrix elements of these operators to extract B meson decay constants and form factors and compare to those obtained using the standard vector and axial vector operators. We work on MILC second-generation 2+1+1 gluon field configurations, including those with physical light quarks in the sea. This provides a test of systematic uncertainties in these calculations and we find agreement between the results to the 2% level of uncertainty previously quoted.