Probing SUSY effects in K S 0 ?→? μ + μ ?

摘要

A bstract We explore supersymmetric contributions to the decay K ~( S )_(0) ?→? μ _(+) μ _(?), in light of current experimental data. The Standard Model (SM) predicts ? K S 0 → μ + μ ? ≈ 5 × 10 ? 12 $$ mathrm{mathcal{B}}left({K}_S^0o {mu}^{+}{mu}^{-}ight)pprox 5imes {10}^{-12} $$ . 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 ? K S 0 → μ + μ ? and ? K L 0 → μ + μ ? $$ mathrm{mathcal{B}}left({K}_S^0o {mu}^{+}{mu}^{-}ight);mathrm{and};mathrm{mathcal{B}}left({K}_L^0o {mu}^{+}{mu}^{-}ight) $$ . Predictions for the CP asymmetry in K _(0)→ μ _(+) μ _(?)decays in the context of MSSM are also given, and can be up to eight times bigger than in the SM.