Light Higgsino dark matter

Manuel Drees, Mihoko M. Nojiri, D. P. Roy, Youichi Yamada

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

We reinvestigate the question of whether a light Higgsino-like neutralino is a viable dark matter candidate. To this end we compute the dominant one-loop corrections to the masses of the Higgsino-like states in the minimal supersymmetric standard model (MSSM), due to loops involving heavy quarks and their superpartners. We also calculate analogous corrections to the couplings of Higgsino-like neutralinos to [Formula presented] and Higgs bosons. In the region of parameter space leading to high Higgsino purity of the lightest neutralino, these corrections can change the expected relic density by up to a factor of 5 in either direction. We conclude that for favorable choices of soft supersymmetry-breaking parameters, a state with more than 99% Higgsino purity could indeed form all cold dark matter in the Universe. In some cases these corrections can also increase the expected cross section for LSP scattering off spinless nuclei by up to two orders of magnitude, or reduce it to zero.

Original languageEnglish
Pages (from-to)276-290
Number of pages15
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume56
Issue number1
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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