1998/01/31 by John Ellis, Toby Falk, G. Ganis +3 · 4 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.58.095002
published as Phys.Rev.D58:095002,1998 · Version to appear in Phys. Rev. D., 21 pages in LateX, including 10 encapsulated postscript figures; uses epsf.sty.; Figures modified (one deleted), conclusions unchanged
openalex publication_date 1998/09/18 · arxiv created 1998/09/22 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We analyze the CERN LEP constraints from searches for charginos \ensuremathχ^\ifmmode±\else\textpm\fi and neutralinos \ensuremathχi, taking into account radiative corrections to the relations between their masses and the underlying Higgs-mixing and gaugino-mass parameters \ensuremathμ, m1/2, and the trilinear mass parameter At. While radiative corrections do not alter the excluded domain in m_\ensuremathχ^\ifmmode±\else\textpm\fi as a function of m_\ensuremathχ^\ifmmode±\else\textpm\fi\ensuremath-m_\ensuremathχ, its mapping into the \ensuremathμ, m1/2 plane is altered. We update our previous lower limits on the mass of gaugino dark matter and on tan\ensuremathβ, the ratio of Higgs vacuum expectation values, in light of the latest LEP data and these radiative corrections. We also discuss the viability of Higgsino dark matter, incorporating coannihilation effects into the calculation of the Higgsino relic abundance. We find that Higgsino dark matter is viable for only a very limited range of \ensuremathμ and m1/2, which will be explored completely by upcoming LEP runs.