Higher-Order Electroweak Contributions to Indirect CP Violation in Neutral Kaons
Z. Polonsky*, J. Brod, S. Kvedaraité and A. Youssef
*: corresponding author
Full text: pdf
Pre-published on: January 31, 2024
Published on: February 01, 2024
Abstract
The parameter $\epsilon_K$ is an important measure of the imbalance between matter and antimatter in the neutral kaon ($K^0$ and $\bar{K}^0$) system. In particular, $\epsilon_K$ provides a highly sensitive probe of new physics and plays a critical role in the global fit of the Cabibbo-Kobayashi-Maskawa matrix. As one of the first discovered sources of CP violation, it has been extensively measured in experiment to per-mil precision. The theoretical calculation of $\epsilon_K$, however, has historically been plagued by large perturbative errors arising from charm-quark corrections. These errors were larger than the expected magnitude of higher-order electroweak corrections in perturbation theory, rendering these contributions irrelevant. Recently, it was discovered that a simple re-parameterization of the effective Hamiltonian drastically reduces perturbative errors, making these higher-order electroweak calculations worth-while. We present the $\mathcal{O}(1\%)$ next-to-leading-logarithm electroweak contributions to $\epsilon_K$.
DOI: https://doi.org/10.22323/1.431.0041
How to cite

Metadata are provided both in article format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in proceeding format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.