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>Improving the theoretical prediction for the B s - B? s width difference: matrix elements of next-to-leading order Δ B = 2 operators
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Improving the theoretical prediction for the B s - B? s width difference: matrix elements of next-to-leading order Δ B = 2 operators
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机译:改善 B s sub> s sub> italic>- B的理论预测? s sub> italic>宽度差:次要领先顺序Δ B italic>的矩阵元素= 2个运算符
We present lattice QCD results for the matrix elements of R _(2)and other dimension-7, Δ B = 2 operators relevant for calculations of Δ_(s), the B _(s)- B?_(s) width 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 ΔΓ_(s)will be substantially reduced.
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