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2022 Update on $\varepsilon_K$ with lattice QCD inputs

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arxiv 2301.12375 v2 pith:RHA6X67A submitted 2023-01-29 hep-lat hep-ph

classification hep-lathep-ph
keywords varepsiloninputslatticesigmatensionfindinclusivemodel
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We present recent updates for $\varepsilon_K$ determined directly from the standard model (SM) with lattice QCD inputs such as $\hat{B}_K$, $|V_{cb}|$, $|V_{us}|$, $\xi_0$, $\xi_2$, $\xi_\text{LD}$, $f_K$, and $m_c$. We find that the standard model with exclusive $|V_{cb}|$ and other lattice QCD inputs describes only 65% of the experimental value of $|\varepsilon_K|$ and does not explain its remaining 35%, which leads to a strong tension in $|\varepsilon_K|$ at the $5.1\sigma \sim 3.9\sigma$ 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, although this inclusive tension is small ($\approx 1.4\sigma$) but keeps increasing as time goes on.

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  1. 2024 Update on $\varepsilon_K$ with lattice QCD inputs

    hep-lat 2024-12 conditional novelty 4.0 of 10

    Using 2024 inputs and exclusive |V_cb|, the standard model predicts only about 65% of the measured |epsilon_K|, a gap that vanishes when inclusive |V_cb| is used.

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