Speaker
Seungyeob Jwa
(Seoul National University)
Description
We present recent updates for $\epsilon_{K}$ determined directly from the standard model (SM) with lattice QCD inputs such as $\hat{B}_{K}$ , $|V_{cb}|$, $|V_{us}|$, $|V_{ud}|$, $\xi_{0}$, $\xi_{2}$, $\xi_{LD}$, $f_{K}$ , and $m_{c}$. We find that the standard model with exclusive $|V_{cb}|$ and other lattice QCD inputs describes only 2/3 of the experimental value of $|\epsilon_{K}|$ and does not explain its remaining 1/3, which leads to a strong tension in $|\epsilon_{K}|$ at the $5\sigma$ 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 the QCD sum rule approach.
Primary authors
Seungyeob Jwa
(Seoul National University)
Weonjong Lee
(Seoul National University)
Co-authors
Mr
Jaehoon Lim
(Samsung Electronics)
Mr
Jeehun Kim
(Seoul National University)
Mr
Sunghee Kim
(Seoul National University)
Sungwoo Park
(Lawrence Livermore National Laboratory)
Mr
Sunkyu Lee
(Seoul National University)
