Light Higgsino dark matter

Drees, Manuel ; Nojiri, Mihoko M. ; Roy, D. P. ; Yamada, Youichi (1997) Light Higgsino dark matter Physical Review D - Particles, Fields, Gravitation and Cosmology, 56 (1). pp. 276-290. ISSN 1550-7998

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We re-investigate 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 Z 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.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:42793
Deposited On:06 Jun 2011 12:32
Last Modified:17 May 2016 23:58

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