New determination of |Vub/Vcb| from $$ {B}_s^0 $$ ? {K-, $$ {D}_s^{-} $$}µ+?

New determination of |Vub/Vcb| from $$ {B}_s^0 $$ ? {K-, $$ {D}_s^{-} $$}µ+?
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|Vub/Vcb|的新测定

DOI:
10.1007/jhep11(2023)082
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发表时间:
2023
影响因子:
5.4
通讯作者:
Bolognani C
Bolognani C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bolognani C

文献摘要

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我们使用带有壳上 kaon 的光锥和规则来更新全套 → K 形状因子。我们的方法首次从贝叶斯拟合中确定相关的求和规则参数——对偶阈值。使用 Boyd-Grinstein-Lebed 参数化的修改版本,我们将低动量传递 q 2 下的求和规则结果与大 q 2 下更精确的晶格 QCD 结果相结合。我们获得了整个 q 2 范围内形状因子的一致描述。将这些结果应用于最近的 LHCb 衰变分支比测量→{K−,} μ+ ν μ,我们确定了 Cabibbo-Kobayashi-Maskawa 元素的比率
We update the full set ofs→ K form factors using light-cone sum rules with an on-shell kaon. Our approach determines the relevant sum rule parameters—the duality thresholds—from a Bayesian fit for the first time. Using a modified version of the Boyd-Grinstein-Lebed parametrisation, we combine our sum rule results at low momentum transfer q 2 with more precise lattice QCD results at large q 2. We obtain a consistent description of the form factors in the full q 2 range. Applying these results to a recent LHCb measurement of branching ratios for the decays→{K−,} μ+ ν μ, we determine the ratio of Cabibbo-Kobayashi-Maskawa elements