论文标题
2021 $ \ varepsilon_k $带有晶格QCD输入的更新
2021 Update on $\varepsilon_K$ with lattice QCD inputs
论文作者
论文摘要
我们介绍了$ \ varepsilon_k $的最新更新，直接从标准型号（SM）确定，带有晶状体QCD输入，例如$ \ hat {b} _k $，$ | v_ {cb} | $，$ | v_ {us} $ m_c $。我们发现，具有独家$ | v_ {cb} | $的标准模型和其他晶格QCD输入仅描述了$ | \ varepsilon_k | $的实验价值的66％\％，并且没有解释其剩余的34 \％，并且在$ | \ varepsilon_k $4.5σ$4.5σ$4.5σ中导致了强度的紧张，这会导致强度的紧张。我们还发现，当我们使用基于QCD总规则方法的重夸克扩展获得的$ | v_ {cb} | $的包含值时，这种张力就消失了。
We present recent updates for $\varepsilon_K$ determined directly from the standard model (SM) with lattice QCD inputs such as $\hat{B}_K$, $|V_{cb}|$, $|V_{us}|$, $ξ_0$, $ξ_2$, $ξ_\text{LD}$, $f_K$, and $m_c$. We find that the standard model with exclusive $|V_{cb}|$ and other lattice QCD inputs describes only 66\% of the experimental value of $|\varepsilon_K|$ and does not explain its remaining 34\%, which leads to a strong tension in $|\varepsilon_K|$ at the $4.5σ\sim 3.7σ$ level between the SM theory and experiment. We also find that this tension disappears when we use the inclusive value of $|V_{cb}|$ obtained using the heavy quark expansion based on the QCD sum rule approach.
