2018 Update on $\varepsilon_K$ with lattice QCD inputs
2018 Update on $\varepsilon_K$ with lattice QCD inputs
We present updated results for $\varepsilon_K$ determined directly from the standard model (SM) with lattice QCD inputs such as $\hat{B}_K$, $|V_{cb}|$, $|V_{us}|$, $\xi_0$, $\xi_2$, $\xi_\text{LD}$, $F_K$, and $m_c$. We find that the standard model with exclusive $|V_{cb}|$ and other lattice QCD inputs describes only 70% of the experimental value of $|\varepsilon_K|$ and does not explain its remaining 30%, which leads to a strong tension in $|\varepsilon_K|$ at the $4\sigma$ 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 QCD sum rules.
Jaehoon Leem、Jon A. Bailey、Weonjong Lee、Sungwoo Park、Yong-Chull Jang、Sunkyu Lee
物理学
Jaehoon Leem,Jon A. Bailey,Weonjong Lee,Sungwoo Park,Yong-Chull Jang,Sunkyu Lee.2018 Update on $\varepsilon_K$ with lattice QCD inputs[EB/OL].(2018-10-23)[2025-05-14].https://arxiv.org/abs/1810.09761.点此复制
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