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Supersymmetric models with low electroweak fine-tuning contain lighthiggsinos with mass not too far from m_h\simeq 125 GeV, while other sparticlescan be much heavier. In the R-parity conserving MSSM, the lightest neutralinois then a higgsino-like WIMP (albeit with non-negligible gaugino components),with thermal relic density well below measured values. This leaves room foraxions (or other, perhaps not as well motivated, stable particles) to functionas co-dark matter particles. The local WIMP abundance is then expected to bebelow standard estimates, and direct and indirect detection rates must beaccordingly rescaled. We calculate rescaled direct and indirect higgsino-likeWIMP detection rates in SUSY models that fulfil the electroweak naturalnesscondition. In spite of the rescaling, we find that ton-scale noble liquiddetectors can probe the entire higgsino-like WIMP parameter space, so thatthese experiments should either discover WIMPs or exclude the concept ofelectroweak naturalness in R-parity conserving natural SUSY models. Prospectsfor spin-dependent or indirect detection are more limited due in part to therescaling effect.

Snowmass whitepaper: Exploring natural SUSY via direct and indirect detection of higgsino-like WIMPs