CP Violation in $B \to K\ell^+\ell^-$ Decays: New Opportunities in the High-Precision Era
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929310923751424 |
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| author | Fleischer, Robert Malami, Eleftheria Rehult, Anders Vos, K. Keri |
| author_facet | Fleischer, Robert Malami, Eleftheria Rehult, Anders Vos, K. Keri |
| contents | Experimental data on rare $B$-meson decays indicate deviations from Standard Model predictions. In studies of these decays, possible new sources of CP violation are often neglected. We discuss CP violation in the rare $B$-meson decays $B\to K\ell^+\ell^- (\ell = μ,e)$ 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 a 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07588 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CP Violation in $B \to K\ell^+\ell^-$ Decays: New Opportunities in the High-Precision Era Fleischer, Robert Malami, Eleftheria Rehult, Anders Vos, K. Keri High Energy Physics - Phenomenology Experimental data on rare $B$-meson decays indicate deviations from Standard Model predictions. In studies of these decays, possible new sources of CP violation are often neglected. We discuss CP violation in the rare $B$-meson decays $B\to K\ell^+\ell^- (\ell = μ,e)$ 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 a 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. |
| title | CP Violation in $B \to K\ell^+\ell^-$ Decays: New Opportunities in the High-Precision Era |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.07588 |