Abstract
We explore supersymmetric contributions to the decay K 0 S → μ+μ−, in light of current experimental data. The Standard Model (SM) predicts \( \mathrm{\mathcal{B}}\left({K}_S^0\to {\mu}^{+}{\mu}^{-}\right)\approx 5\times {10}^{-12} \). We find that contributions arising from flavour violating Higgs penguins can enhance the branching fraction up to ≈ 35 × 10−12 within different scenarios of the Minimal Supersymmetric Standard Model (MSSM), as well as suppress it down to ≈ 0.78 × 10−12. Regions with fine-tuned parameters can bring the branching fraction up to the current experimental upper bound, 8 × 10−10. The mass degeneracy of the heavy Higgs bosons in MSSM induces correlations between \( \mathrm{\mathcal{B}}\left({K}_S^0\to {\mu}^{+}{\mu}^{-}\right)\;\mathrm{and}\;\mathrm{\mathcal{B}}\left({K}_L^0\to {\mu}^{+}{\mu}^{-}\right) \). Predictions for the CP asymmetry in K0 → μ+μ− decays in the context of MSSM are also given, and can be up to eight times bigger than in the SM.
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Chobanova, V., D’Ambrosio, G., Kitahara, T. et al. Probing SUSY effects in K 0 S → μ+μ−. J. High Energ. Phys. 2018, 24 (2018). https://doi.org/10.1007/JHEP05(2018)024
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DOI: https://doi.org/10.1007/JHEP05(2018)024