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Under the expectation that nature is natural, we extend the Standard Model toinclude SUSY to stabilize the electroweak sector and PQ symmetry to stabilizethe QCD sector. Then natural SUSY arises from a Kim-Nilles solution to the SUSYmu problem which allows for a little hierarchy where mu ~ f_a^2/M_P ~ 100-300GeV while the SUSY particle mass scale m(SUSY)~ 1-10 TeV >> mu. Dark matterthen consists of two particles: a higgsino-like WIMP and a SUSY DFSZ axion. Therange of allowed axion mass values m(axion) depends on the mixed axion-higgsinorelic density. The range of m(axion) is actually restricted in this case bylimits on WIMPs from direct and indirect detection experiments. We plot theexpected axion detection rate at microwave cavity experiments. Theaxion-photon-photon coupling is severely diminished by charged higgsinocontributions to the anomalous coupling. In this case, the axion may retreat,at least temporarily, back into the regime of near invisibility. From ourresults, we urge new ideas for techniques which probe both deeper and morebroadly into axion coupling versus axion mass parameter space.

Prospects for axion detection in natural SUSY with mixed axion-higgsino dark matter: back to invisible?