55 research outputs found

    Gluino-mediated electroweak penguin with flavor-violating trilinear couplings

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    In light of a discrepancy of the direct CPCP violation in KππK\to\pi\pi decays, ε/εK\varepsilon'/\varepsilon_K, we investigate gluino contributions to the electroweak penguin, where flavor violations are induced by squark trilinear couplings. Top-Yukawa contributions to ΔS=2\Delta S = 2 observables are taken into account, and vacuum stability conditions are evaluated in detail. It is found that this scenario can explain the discrepancy of ε/εK\varepsilon'/\varepsilon_K for the squark mass smaller than 5.6 TeV. We also show that the gluino contributions can amplify B(Kπνν)\mathcal{B}(K \to \pi \nu \overline{\nu}), B(KSμ+μ)eff\mathcal{B}(K_S \to \mu^+ \mu^-)_{\rm eff} and ΔACP(bsγ)\Delta A_{\rm CP}(b\to s\gamma). Such large effects could be measured in future experiments.Comment: 30 pages, 8 figures; references added, version published in JHE
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