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Mirage mediation realized in the Kachru-Kallosh-Linde-Trivedi (KKLT) fluxcompactification can naturally suppress the up-type Higgs soft mass at lowenergy scales. As a result, compared to the conventional scenarios, the degreeof electroweak fine-tuning can be reduced further up to by a loop factor if theHiggsinos are much lighter than the heavy Higgs doublet. Interestingly, thisfeature holds even in high-scale supersymmetry as long as the gauge couplingunification, which is required as a prerequisite for mirage mediation,accommodates such light Higgsinos. Under the experimental constraints on theobserved Higgs boson, it turns out that mirage mediation can exhibit lowelectroweak fine-tuning better than a few percent for stops between about 2 and6 TeV, i.e., at the same level as in the weak scale supersymmetry, if theHiggsinos are around or below a few hundred GeV.

Light Higgsinos for electroweak naturalness in mirage-mediated high-scale supersymmetry