A matching framework from arbitrary KSVZ UV completions to SMEFT and ALP EFT yields robust operator bounds from global fits that often dominate direct ALP searches except when mass mixing occurs.
Probing SUSY effects in $K_S^0\rightarrow\mu^+\mu^-$
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abstract
We explore supersymmetric contributions to the decay $K_S^0\rightarrow\mu^+\mu^-$, in light of current experimental data. The Standard Model (SM) predicts $\mathcal{B}(K_S^0\rightarrow\mu^+\mu^-)\approx5\times 10^{-12}$. We find that contributions arising from flavour violating Higgs penguins can enhance the branching fraction up to $\approx 35\times 10^{-12}$ within different scenarios of the Minimal Supersymmetric Standard Model (MSSM), as well as suppress it down to $\approx 0.78\times 10^{-12}$. Regions with fine-tuned parameters can bring the branching fraction up to the current experimental upper bound, $8\times 10^{-10}$. The mass degeneracy of the heavy Higgs bosons in MSSM induces correlations between $\mathcal{B}(K_S^0\rightarrow\mu^+\mu^-)$ and $\mathcal{B}(K_L^0\rightarrow\mu^+\mu^-)$. Predictions for the $CP$ asymmetry in $K^0\rightarrow\mu^+\mu^-$ 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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UNVERDICTED 2representative citing papers
Combined time-integrated CP asymmetry A_CP and B(K_S to mu mu) measurements, using known B(K_L to mu mu) and B(K_L to gamma gamma), extract the short-distance amplitude |A^2 lambda^5 eta-bar| and resolve the discrete ambiguity in the SM prediction for B(K_L to mu mu).
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The KSVZ Atlas: A Unified SMEFT-ALP Framework
A matching framework from arbitrary KSVZ UV completions to SMEFT and ALP EFT yields robust operator bounds from global fits that often dominate direct ALP searches except when mass mixing occurs.
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CP violation in $K\to\mu^+\mu^-$ with and without time dependence through a tagged analysis
Combined time-integrated CP asymmetry A_CP and B(K_S to mu mu) measurements, using known B(K_L to mu mu) and B(K_L to gamma gamma), extract the short-distance amplitude |A^2 lambda^5 eta-bar| and resolve the discrete ambiguity in the SM prediction for B(K_L to mu mu).