Direct detection rate of heavy Higgsino-like and Wino-like dark matter

Qing Chen, Richard J. Hill

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Many viable dark matter models contain a WIMP candidate that is a component of a new electroweak multiplet whose mass M is large compared to the electroweak scale mW. A generic amplitude-level cancellation in such models yields a severe suppression of the cross section for WIMP-nucleon scattering, making it important to assess the impact of formally subleading effects. The power correction of order mW/M to the heavy WIMP limit is computed for electroweak doublet (Higgsino-like) dark matter candidates, and a modern model of nuclear modifications to the free nucleon cross section is evaluated. Corrections to the pure Higgsino limit are determined by a single parameter through first order in the heavy WIMP expansion. Current and projected experimental bounds on this parameter are investigated. The direct detection signal in the pure Higgsino limit remains below neutrino backgrounds for WIMPs in the TeV mass range. Nuclear corrections are applied also to the heavy Wino case, completing the investigation of combined subleading effects from perturbative QCD, 1/M power corrections, and nuclear modifications.

Original languageEnglish
Article number135364
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - May 10 2020

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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