1999/08/18 by S. Choi, S. Y. Choi, Choi, S. Y.
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9908397
Revtex, 22 pages, 1 ps and 3 eps figures
arxiv created 1999/08/18 · openalex publication_date 1999/08/18 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We re-investigate the neutralino-nucleus elastic scattering as a promising dark matter detection mechanism including contributions from the scalar-pseudoscalar mixing of neutral Higgs states and the induced phase between two Higgs doublets due to the CP-violating phases of the scalar top and bottom sectors in the minimal supersymmetric standard model. The spin-dependent part of the cross section turns out to be hardly affected by the CP-violating induced phase due to a mutually destructive unavoidable suppression mechanism of various relevant supersymmetric parameters. On the other hand, although the phase Φμ of the higgsino mass parameter is set to be zero, the spin-independent part, which can dominate over the spin-dependent part for heavy nuclei, can be strongly dependent on the CP-violating scalar-pseudoscalar mixing and the induced phase, in particular, for a large |μ|, a small charged Higgs boson mass, and a large trilinear term |A| compared to the SUSY breaking scale. For a small tanβ and a large |μ|, the spin-independent cross section is enhanced by an order of magnitude as the phase ΦA of the trilinear term increases up to π, while for a large tanβ and a large |μ| the spin-independent cross section is significantly suppressed for non-zero values of the phase ΦA.