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

Understand

Supersymmetric models with low electroweak fine-tuning contain light higgsinos with mass not too far from m_h\simeq 125 GeV, while other sparticles can be much heavier.

• In the R-parity conserving MSSM, the lightest neutralino is then a higgsino-like WIMP (albeit with non-negligible gaugino components), with thermal relic density well below measured values.
• This leaves room for axions (or other, perhaps not as well motivated, stable particles) to function as co-dark matter particles.
• The local WIMP abundance is then expected to be below standard estimates, and direct and indirect detection rates must be accordingly rescaled.