PoS - Proceedings of Science
Volume 463 - Corfu Summer Institute 2023 "School and Workshops on Elementary Particle Physics and Gravity" (CORFU2023) - Workshop on the Standard Model and Beyond
CP Violation in $B \to K\ell^+\ell^-$ Decays: New Opportunities in the High-Precision Era
A. Rehult*, R. Fleischer, E. Malami and K. Vos
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Published on: July 31, 2024
Abstract
Experimental data on rare $B$-meson decays indicate deviations from Standard Model predictions. In studies of these decays, new sources of CP violation are often neglected. We discuss CP violation in the rare $B$-meson decays $B\to K\ell^+\ell^- (\ell = \mu,e)$ and point to two phenomena that arise when new sources of CP violation are included. First, the Wilson coefficients $C_{9\ell}$ and $C_{10\ell}$ become complex, and we show how we can extract their values from measurements of direct and mixing-induced CP asymmetries. Second, new sources of CP violation can generate nontrivial lepton flavour universality violation. Such violation is usually measured through ratios like $R_K$ and $R_{K^*}$, but we show that measuring only these ratios leaves a large parameter space unexplored. These results bring exciting opportunities to reveal New Physics effects in the high-precision era.
DOI: https://doi.org/10.22323/1.463.0128
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