论文标题
使用$ b \toππ$和$ b \toρρ$衰减来限制CKM期alpha测量中的Electroweak Penguin图贡献
Constraining electroweak penguin graph contributions in measurements of the CKM phase alpha using $B\toππ$ and $B\toρρ$ decays
论文作者
论文摘要
Cabibbo-Kobayashi-Maskawa（CKM）矩阵的单位性通过直接和间接测量都很好地确定，而没有任何差异证据。 CKM弱相$α$是使用$ b \ rightarrow的ππ$和$ b \ toρρ$的ISOSPIN分析直接测量的，假设可以忽略Electroweak Penguin贡献。但是，电动企鹅对NP很敏感，因此，重要的是要实验估计其效果很重要。我们直接从$ b \rightarrowππ$和$ b \ρρ$实验数据确定了Electroweak Penguin和Isospin振幅的尺寸，此外还使用了$α$的间接测量值。我们发现Electroweak Penguin的贡献确实很小，并且与1σ$内的SM期望一致。我们还发现，$ΔI= \ tfrac {1} {2} $过渡幅度的温和增强。
The unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix has been well established by both direct and indirect measurements without any evidence of discrepancy. The CKM weak phase $α$ is directly measured using an isospin analysis in $B\rightarrow ππ$ and $B\to ρρ$ assuming that electroweak penguin contributions are ignorable. However, electroweak penguins are sensitive to NP, hence, it is important to experimentally estimate their effects. We determine the size of both electroweak penguin and isospin amplitudes, directly from $B\rightarrow ππ$ and $B\to ρρ$ experimental data, using in addition the indirectly measured value of $α$. We find that electroweak penguin contribution are indeed small and agree with SM expectations within $1σ$. We also find that there is a mild enhancement of the $ΔI=\tfrac{1}{2}$ transition amplitude.
