Coannihilation Effects and Relic Abundance of Higgsino-Dominant LSPs
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We calculate the relic abundance of Higgsino-dominant lightest superparticles, taking account of coannihilations with the superparticles which are almost degenerate with the lightest one. We show that their relic abundance is reduced drastically by the coannihilation processes and hence they are cosmologically of no interest.
11 pages, 8 figures (not included, but available on request), in LaTeX, TU-409
11 pages, 8 figures (not included, but available on request), in LaTeX, TU-409