Probing SUSY effects in K S 0  → μ + μ

• Published in: The journal of high energy physics Vol. 2018; no. 5; pp. 1 - 34
• Main Authors: Chobanova, Veronika, Giancarlo D’Ambrosio, Kitahara, Teppei, Miriam Lucio Martínez, Diego Martínez Santos, Isabel Suárez Fernández, Yamamoto, Kei
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01.05.2018; SpringerOpen
• Subjects: Bosons; Higgs bosons; High energy physics; Mathematical models; Standard model (particle physics); Supersymmetry; Supersymmetry Phenomenology; Upper bounds
• ISSN: 1029-8479
• DOI: 10.1007/JHEP05(2018)024

We explore supersymmetric contributions to the decay KS0 → μ+μ−, in light of current experimental data. The Standard Model (SM) predicts ℬKS0→μ+μ−≈5×10−12. 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 ℬKS0→μ+μ−andℬKL0→μ+μ−. 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.