Search

We find that the phase appearing in the unitarity relation between B K L → μ + μ − and B K L → γγ is equal to the phase shift in the interference term of the time- dependent K → μ+μ− decay. A probe of this relation at future kaon facilities constitutes a Standard Model test with a theory precision of about 2%. The phase has further importance for sensitivity studies regarding the measurement of the time-dependent K → μ+μ− decay rate to extract the CKM matrix element combination ∣ V ts V td sin β + β s ∣ ≈ A 2 λ 5 η ¯ . We find a model-independent theoretically clean prediction, cos2φ0 = 0.96 ± 0.03. The quoted error is a combination of the theoretical and experimental errors, and both of them are expected to shrink in the future. Using input from the large-NC limit within chiral perturbation theory, we find a theory preference towards solutions with negative cos φ0, reducing a four-fold ambiguity in the angle φ0 to a two-fold one. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]