Improving the theoretical prediction for the B s - B¯ s width difference: matrix elements of next-to-leading order ? B = 2 operators
Improving the theoretical prediction for the B s - B¯ s width difference: matrix elements of next-to-leading order ? B = 2 operators
复制标题
改进 B s - B s 宽度差的理论预测：次前导阶的矩阵元素 ?
DOI：
10.1051/epjconf/201817513023
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发表时间：
2018
影响因子：
--
通讯作者：
Davies C
中科院分区：
文献类型：
--
作者：
Davies C
我们给出了r2的矩阵元素和其他与计算Δs， bs - b′s宽度差相关的7维，ΔB= 2算子的晶格QCD结果。我们使用MILC合作的2+1 +1味规范场配置的5个集合计算了相关函数，跨越3个晶格间隔和轻海夸克质量直至物理点。HISQ作用用于价奇异夸克，NRQCD作用用于底夸克。一旦我们的分析完成，标准模型预测ΔΓswill的理论不确定性将大大降低。
We present lattice QCD results for the matrix elements ofR2and other dimension-7, ΔB= 2 operators relevant for calculations of Δs, theBs-B̅swidth difference. We have computed correlation functions using 5 ensembles of the MILC Collaboration’s 2+1 + 1-flavour gauge field configurations, spanning 3 lattice spacings and light sea quarks masses down to the physical point. The HISQ action is used for the valence strange quarks, and the NRQCD action is used for the bottom quarks. Once our analysis is complete, the theoretical uncertainty in the Standard Model prediction for ΔΓswill be substantially reduced.